Since its not your only camera, I would get an X100 series if you want Fuji. The flash sync capabilities are pretty rare, not many cameras can do it. It also has Fuji’s freaky viewfinder I’ve never tried. X-T whatever has neither.
If you want to use different lenses, get a Canon or something, since you already have Canon stuff. My EOS RP fits just fine in the mini camera bag my X-E1 used to be in, even with an EF lens on there. An EF-M camera would work too. But no Canon, and barely any cameras at all that a normal person would buy or tote around with them, can sync the flash like the X100 cameras can.
I like the 35mm equivalent focal length for general use, I don’t know about you. Get an X100, its so much different from your Canon. XT Fujis are still Fujis, but they do the same job as the camera you have now, X100 does something your camera doesn’t, which is sync the flash, even automatically, in bright sunlight, at whatever shutter speed you need, without using a trick HSS mode. It’s awesome for casual snapshots, and potentially powerful for serious stuff too I guess. You gotta mess around with speedlights and menus to get your Canon to do anything similar to that.
I wouldn’t get into Fuji as an interchangeable lens system today personally, especially in addition to another camera system, I dipped my toe in the water and bailed rather than switch to it or start buying any of their better lenses, it would be burdensome for me to buy good lenses for Fuji AND Canon, but the cool thing about the X100 cameras is I can still just pick one up some day if I want too, you don’t have to get invested in anything at all really, just the camera. And it comes with basically all of Fuji’s most unique stuff in there, its more “Fuji” than the XT cameras, if you know what I mean lol.
Oh, I have to add too, I think if I did ever decide to use only Fuji, I’d skip the 23mm lens and get one of the X100 cameras instead, because of its flash sync abilities, and it doesn’t cost more than the lens + whatever other decent Fuji body. I use a 35mm lens as my normal lens basically, so I wouldn’t mind one attached to a camera.