A Replacement CPU Awaits
There are plenty of old SNES boxes lying around that don’t quite work properly anymore, and even more great memories of both playing SNES games and blowing on the cartridges to get them to work again. If you have a dead SNES or see one at a garage sale you want to grab, a project link from Hackaday will show you how to replace the CPU on the system with a working chip.
The ICE40HX8K FPGA is not even $20 and with the use of two flex PCBs to go from the FPGA mainboard to the SNES motherboard itself you can bring it back to life. If you are willing to wait, it sounds like you will be able to buy a drop in replacement in the not too distant future.