The G7 is not a bad camera but for proper use of adapted lenses I would try to get as close to the native sensor / film format as possible. m4/3 would not be my recommendation.
You are right about Fuji lenses being pricey, the bodies on the other hand are pretty cheap, at least some are. Something like the X-E1 will spit out beautiful color jpeg files and is APS-C, so at least closer to 35mm film.
If it doesn’t have a hotshoe, it’s not a camera in my mind. I wouldn’t recommend that one. Also premium compacts are delicate creatures, most have moving lenses and stuff that breaks easily. My Panasonic LX100 knows…
@Automobili3XF OK, so in this case I would go mirrorless and manual everything with adapted glass. That way you get a feel for what is doing what pretty quick. The mentioned Fuji X-E1 (or X-E2 or X-T1 if you can get one cheap) does have manual dials for time and exposure compensation. Combined with the aperture setting on adapted lenses as well as manual and automatic ISO, you are good to go for almost anything. If you have to have some autofocus zoom lens, you can get one later on.
In general any APS-C sensor mirrorless should be fine and the easier it is to dial in stuff manually the better.
For lenses I would try to get a 24mm, which is slightly wide angle, and a somewhat fast 50 to 60mm lens. (As in a 55mm or something, not a zoom from 50 to 60. )