Hi all! Sounds like the start of another great LCT group on this itinerary.
I've been out of town so sorry for the late reply. The private guides section on this website does include some ideas for a private guide in Nice. We didn't use one so I can't personally recommend or comment. The thread is more than 45 days old so you can either set the date for showing messages as one year or do a search on this site for Nice. Claudia made some recommendations so you could try searching under her name, too.
Enjoy! Really wish we were going with you but will be there in spirit. Cheers, Anne