Yes, I am a bit wary, which is why you will note these additional appearances are very brief, largely just snipping existing footage and pasting it in another episode, and I have used only two deepfaked scenes to say two lines. I believe that the AI debate is more concerned with people using images inappropriately (porn, political messaging, scam adverts, and/or profiting from the actors' images) and it being a slippery slope. The original actors never got residuals for any of these old appearances though, so I don't feel like I am doing Grace a disservice.
Obviously, your mileage may vary.
After SNW, I am quite comfortable (with slight reservations such as Scotty being a bit young) with them recasting as a way to develop these old characters but if a deal can be done with the actors' estates, that would be so lovely. The Roddenberry Vault seems to be very respectful of the material and the actors.
I'm also conscious that Majel Barrett's voice has not been re-used, despite fan support and her open willingness for it to be so. I am not sure why this wasn't embraced by the makers of the new shows but it demonstrates that a lot goes on behind the scenes and the issue isn't at all straightforward.
Overall, my motivation is to do a little bit to tweak the skewed female dynamic of TOS, to demostrate that Rand had wasted potential as a main character, and most of all, as an homage to the actress who had great affection for her fans. I truly hope that I don't offend anyone!