Hi,
(sorry to do a rather epic necro!)
So, theoretically, seeing as these backgrounds were ripped out successfuly, would it be possible to modify them and put them back in the game?
I've tried upscaling them via Let's Enhance (NN ai based upscale) and with some Photoshop tweaking, the result is pretty interesting. (might look quite a bit better than various filters in emulators)
Would the game even run with textures four times the resolution? Maybe an emulator would allow for this?