I'm in the same predicament as you, I haven't taken my sims to SM in ages because of all the bugs there and fear of my save being corrupted again, I don't own For Rent either so my corruption was caused specifically by the city living bugs, but I do really miss visiting the city and attending the festivals and flea market and it would be nice when my sims get invited to attend the festivities my sim can say yes again, rather than just ignoring the invitation! so my plan is to visit there when I move my sims daughter out of home and into her own save file as a test file, that way if anything goes wrong I'll still have her in her family save as I make two save files for every household (one as a back up) and can just delete the new save if it corrupts and I won't have lost anything really important and it won't impact my main legacy save in any way, I can just revert back to the save before she split from the household as if her moving out never happened 😁
