I am pretty sure it would run in the same wine setup, but nobody bothered to set it up as an install script yet, so you’d need to do some manual dirtywork.
Krita is really good for digital drawing and painting, but photoshop does cover a lot of other things, which krita can not do. In that sense Krita is more of a Corel PaintShop Pro alternative. While GIMP is the best, but still very bad, alternative to photoshop.
There isn’t even a real photoshop competitor in the broader market, but you want to further split the hobbyist devs effort on linux as well?
I think instead it would be better to focus all the effort on a single solution that strives to cover all of photoshops features, with at least equal or better usability. Like has been done with Blender and godot for example. (And GIMP is sadly faaar from it still)
On linux you could easily do it, by running a script every n minutes that takes a screenshot and pipes it to an ai and then stores it wherever you want (including a local NAS)
With some extra effort you could tie it into the DE/WM and take a screenshot when a new app is opened or on focus switch or virtual desktop change or whatever and then slow down the periodic ones - so you don’t end up making 3000 screenshots of the same long gaming session. Or just constantly log the currently running processes as well to give the ai additional context.
There are so many cool opportunities with this. I hope somebody makes something cool and useful with it for Linux, that runs completely locally. You could then ask your computer “Hey, what video did I watch about godot a week ago, it had something with tilesets in it and I was coding alongside it”. Or "how many hours have I been working on that project for in the last 2 weeks?’
I don’t know how important the CPU is for those workloads tbh. but I feel like not as important so maybe you’re fine leaving it as it is.
I think AMD wanted to release a new GPU lineup (radeon 8000 series) sometime this year/early next year. Maybe just wait for that, sell your old card on the used market and buy a new one?
For 50$ you get a huge iso with “everything” preinstalled and they use the money to work on that and make sure it works on lots of devices and that all the software works together.