I just picked up a mint Olympus 35 SP, just like my Dad had back in the 70s. I intend to use slide film in it. He used to use Kodachrome and he always used a flash indoors.
The Olympus uses a "Flashmatic" system where you just dial the ring to the guide number of your flash and it calculates the proper exposure. So the flash doesn't have to be TTL. What I need is a small, light electronic flash and a slide film that if won't look as good as Kodachrome will at least look pretty good when used with a flash.