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LD Trivia: In addition to Nana Visitor and Armin Shimerman, they also got Morn's original voice actor to reprise his role for "Hear All, Trust Nothing"
(startrek.website)
It's fortunate they got him to agree to a flat fee rather than per word or the episode would have been way over budget.
They probably could, technically speaking. The "audio clip show" episode they did on Prodigy felt a little graverobber-y, though. I loved seeing Spock and Odo again, even in animated form, but I thought the archival restrictions on the dialogue emphasised that.
On the other hand, I would spit bile at any attempt to "reanimate" (ie, deepfake) late actors on the show. It was creepy when Star wars did it with Peter Cushing, and it's the same now, with "genAI".
One exception IMO might be Majel Barrett. As I understand it, she consented before her passing to having her voice and speech patterns digitised for such a purpose. Somehow, it would be fitting for her to always be the voice of Trek computers ❤️