I suspect that as interesting as Theodore himself may be to intellectuals of the time - and, perhaps, the Corsican government as a concept - actually living on Corsica will not hold much attraction. The isle has no (real) universities, no libraries, no printing presses, no operas, no theaters... it's not exactly a thriving intellectual and cultural center. Moreover, Theodore doesn't really have the cash to offer anyone patronage. It seems more likely to me that Theodore's interaction with the European intellectual world, insofar as it occurs, will mostly be through letters, as Theodore was a rather prolific letter-writer and can converse with essentially any of the intellectuals of his time in their own language. We may see some OTL famous people pay a visit, but the only learned persons who are likely to take refuge on Corsica at this point in time are probably Jews, who have a very good reason to come to Corsica despite its intellectual backwardness.
One of the upcoming chapters will be on the first Jews of Corsica. I say "one of" because the next few planned chapters take place at more or less the same time (about 1750-1755 or so), so I don't really have a precise order for them yet.
Yes, Voltaire might take umbrage at the lack of luxury. One who might not would be Diderot who never had much of it. Despite its rusticity, it would likely be a lot easier to compile Encyclopédie in Corsica, when in France he had to endure a decade of constant police raids, penury and the destruction of the proofs of his more controversial entries by his own publisher, leading to the working taking until 1772 to finish.