Agree with most of the above, an original 6D is a capable camera, streets ahead of the 18MP APS-C Canons of the time with respect to noise, and as they’ve been on the market a few years you might find one at a good price.
I’d be curious about the current crop of 24MP APS-C Canons, that sensor appears roughly in the same ballpark as its competitors in many respects. Would like to try one for astro.
But for size and weight, the Fujifilm X-series are hard to beat, especially at the promotional pricing that (seemingly frequently) comes around. It’s mostly intervalometer territory though, as only the high end models tether to a computer
I have two of the bargain basement models and they’re excellent daytime stills cameras, with better than average Ha response after dark.