Nice! Glad to know this is a work-around that can work for me for the time being. (And for others who really want something working right now and know how to manually set this up.)
I did some texts with exported JPEGs side-by-side with darktable, and things did look exactly the same color-wise, so I figured it was probably working. Super happy to have a confirmation that this should actually work. (Thanks, @dutch_wolf!!!)
The color profile I made was not actually done via GNOME’s color management setting, but with DisplayCal on Fedora 31 in a toolbox on Fedora 32 (to work-around the lack of Python 2 in Fedora 32). More info in this thread: DisplayCAL and Fedora 32 - #12 by garrett. Wacky, right?
But, yeah, this all feels like a stack of cards just be able to run a modern distro with Wayland to have things work. (At least on my very nice, but standard display.)
For everyone who doesn’t want to jump through hoops, keep using X for now, I guess?
Looking forward to the eventual progress where everything works by default again, in Wayland.