Any other retail lot purpose should function. I have a combined retail lot in my game where part of it is a fashion boutique and the other side is an electronics store. When I play that lot as the owner, sims will randomly go between the two shops and when they're ready to purchase something I never know which side they'll actually buy something from, but it works fairly well. A bakery would therefore probably be functional.
A cafe would probably work okay as well, though you'd likely have to hire a vendor every time you go to the lot.