well, no... "Illuminati" means "illiminated (ones/things)". It's the writeups which are being illuminated.
The people doing it would be illuminatores.
I believe the term for those who copied manuscripts, often embellishing with illuminations, was scriba librarius, usually abbreviated as simply librarius. The plural would be librariis, apparently. (but IANALS)
Update: If instead we choose to take the word "Illuminati" as being Italian rather than Latin, then illuminators would be Illuminatori. Which maybe swings better in context.
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