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Do we have any surviving texts or references to texts with Romano-Celtic authors and how common were 'non-Greco-Italian' (I'm not sure of the best term for that) authors? Specifically within the Roman period, roughly 43 AD to 410 AD in Britain and 58 BC to 486 AD in Gaul. Not later writers that may have maintained a Romano identity such as Gildas (c. 500 - 570), but (St) Patricius (c. 385 - 461) being born prior to 410 would be fine even if he wrote post 410.

I remember seeing a reference to a Roman play write who was originally a Gaulish slave before being released but I was unable to find anything solid.

Since I have a good memory, I remembered and/or looked up a few names of Roman citizens who lived in Gaul or Britain or came from Gaul or Britain to other parts of the empire, and who wrote. These writers could be in ancestry anything from 100 percent Roman, or Spanish, or Egyptian, or Syrian, or Greek, or whatever, to 100 percent native Gauls or Britons descended from Celts. Probably most of them were of highly mixed ancestry.

Ausonius

Decimus or Decimius Magnus Ausonius (/ɔːˈsoʊniəs/; c. 310 – c. 395) was a Roman poet and teacher of rhetoric from Burdigala in Aquitaine, modern Bordeaux, France. For a time he was tutor to the future emperor Gratian, who afterwards bestowed the consulship on him. His best-known poems are Mosella, a description of the river Moselle, and Ephemeris, an account of a typical day in his life. His many other verses show his concern for his family, friends, teachers, and circle of well-to-do acquaintances and his delight in the technical handling of meter.

Sidonius Apollonaris

Gaius Sollius Modestus Apollinaris Sidonius, better known as Saint Sidonius Apollinaris (5 November of an unknown year, c. 430 – August 489 AD), was a poet, diplomat, and bishop. Born in Lugdunum (present-day Lyon, France), Sidonius is "the single most important surviving author from fifth-century Gaul" according to Eric Goldberg. He was one of four Gallo-Roman aristocrats of the fifth- to sixth-century whose letters survive in quantity; the others are Ruricius bishop of Limoges (died 507), Alcimus Ecdicius Avitus, bishop of Vienne (died 518) and Magnus Felix Ennodius of Arles, bishop of Ticinum (died 534). All of them were linked in the tightly bound aristocratic Gallo-Roman network that provided the bishops of Catholic Gaul. His feast day is 21 August.

Alcimus Ecdicius Avitus

Alcimus Ecdicius Avitus (c. 450 – February 5, 517/518 or 519) was a Latin poet and bishop of Vienne in Gaul. His fame rests in part on his poetry, but also on the role he played as secretary for the Burgundian kings.

Avitus was born of a prominent Gallo-Roman senatorial family related to Emperor Avitus.

Ruricius

Ruricius I (c. 440 – c. 510) was a Gallo-Roman aristocrat and bishop of Limoges from c. 485 to 510. He is one of the writers whose letters survive from late Roman Gaul, depicting the influence of the Visigoths on the Roman lifestyle. He should not be confused with his son-in-law, Saint Rusticus (Archbishop of Lyon).

Magnus Felix Ennodius

Magnus Felix Ennodius (473 or 474 – 17 July 521 AD) was Bishop of Pavia in 514, and a Latin rhetorician and poet.

He was one of four Gallo-Roman aristocrats of the fifth to sixth-century whose letters survive in quantity: the others are Sidonius Apollinaris, prefect of Rome in 468 and bishop of Clermont (died 485), Ruricius bishop of Limoges (died 507) and Alcimus Ecdicius Avitus, bishop of Vienne (died 518). All of them were linked in the tightly bound aristocratic Gallo-Roman network that provided the bishops of Catholic Gaul. He is regarded as a saint, with a feast day of 17 July.

Some of the above might possibly be ancestors of Charlemagne, and thus of millions of contemporary people.

Pelagius

Pelagius (c. AD 360 – 418) was a theologian of British origin who advocated free will and asceticism.

Because Palagius was accused of heresy, most of what is known about his teachings comes from hostile comments by his opponents.

Silvius Bonus

One of the poems of Ausonius attacks a rival poet, Silvius Bonus from Britain, in a poem saying that it is a contradiction in terms for a Briton to be Bonus (good).

It has been suggested that Silvius Bonus could have been a relative of Vortigern.

Anyway, those are the first few names I remembered or could dig up.

There is a certain Rutilius Namatianus who lived in the early 5th century Gaul. I do not know how much Celtic ancestry he had.

He admired Rome and considered his family part of its "sacred Genius", but his poem clearly shows patriotic emotions to his narrower homeland:

Rather will you marvel, reader, that my quick return journey (to
Gaul) can so soon renounce the blessings of the city of Romulus. What
is too long for men who spend all time in venerating Rome? Nothing is
ever too long that never fails to please. How greatly and how often
can I count those blest who have deserved birth in that happy soil!
Those high born scions of Roman nobility crown their honourable birth
with the lustre of the Capital! On no other land could the seeds of
virtues have been more worthily let fall by heaven's assignment. Happy
they too who, winning meeds next to the first, have enjoyed Latin
homes! The Senate-house, though fenced with awe, yet stands open to
foreign merit, nor deems those strangers who are fittingly its own.
They share the power of their colleagues in the senatorial order, and
possess part of the sacred Genius which they revere, even as
from ethereal pole to pole of the celestial vault we believe there
abideth the council of the Deity Supreme. But 'tis my fortune that
is plucked back from the well-loved land; the fields of Gaul summon
home their native. Disfigured they are by wars immeasurably long, yet
the less their charm, the more they earn pity. 'Tis a lighter crime to
neglect our countrymen when at their ease: our common losses call for
each man's loyalty. Our presence and our tears are what we owe to the
ancestral home: service which grief has prompted ofttimes helps. 'Tis
sin further to overlook the tedious tale of disasters which the delay
of halting aid has multiplied: now is the time after cruel fires on
ravaged farms to rebuild, if it be but shepherd's huts. Nay, if only
the very springs could utter words, if only our very trees6 could
speak, they well might spur my laggard pace with just complaints and
give sails to my yearning wishes. Now that the dear city slackens her
embrace, my homeland wins, and I can scarce feel patient with a
journey deferred so late.