OM-5 of Panasonic G100 would probably be great for what you need. Can also get used/older micro 3/4 gear for pretty cheap as the other commenter said.
I like to walk around with my GX-85 (sadly discontinued now) and a 14-150 zoom, it’s a very good combo. 12-100 is better, but more $. Even the kit 12-32 is a surprisingly good lens.