I got a few listed in my fsft post https://hardforum.com/threads/fs-cpu-gpu-2230-nvme-m-2-ssds-great-for-steamdeck-hdds.2016369/ too if the above does not work out.
I would say take a look at this video by eta prime, not sure if you have the same deals up there but you can get a ton of pc power on the cheap, and just drop in a modern gpu.
I would say think of it like a dodge hellcat vs a corvette c8 you would think the 707 HP Hellcat would smoke the 485HP Corvette, but they are very close except in full stop 1/4 mile drag. I would suggest though looking for a used cheaper...