I would like to offer the following service to people. Pay me $5 plus return shipping. I will desolder the CPU and PPU chips off your nes pcb for you.
Simply remove the pcb from the rest of the system. Send it to me and I will remove both of these chips quick and clean. I have a Hakko FR-300 and w/a clean filter it removes these chips clean and quick.
I recommend you ship the pcb in an antistatic bag. A board only weighs about 8 oz so you should easily be able to keep it under a lb and shipping via pp multi order shipping or maybe even usps online you can do first class for up to 15.999 ounces for around $5. This entire service should cost about $15 for you.
Some people consider this a hard job, I do not.
Just to clear any confusion, yes I will ship the board AND the chips back to you lol.