Not a Father Ted fan then?? ...... https://fatherted.fandom.com/wiki/The_Magic_Road#:~:text=The%20Magic%20Road%20is%20a,of%20gravity%20have%20no%20meaning.

I'm certain there was a professionally produce 'retropie' Gameboy release the other year.... Can't remember who did it through.

When buying retropie kits, you can source new screens, power, the lot. Huuuuge community out there, so promise someone has already gone through it all & has probably written a guide!

Can't point you specifically to any site, but know I've seen it all when I've looked previously.

Lots of videos on how to build a 'retropie' Gameboy. I built a system a couple of years ago, but not quite as small as a Gameboy. The raspberry pie systems have got silly small & capable now, & software is just 'download & go'.

Hardest thing these days ..... Roms. Technically all illegal to download (well certainly the big games you want), but sites are being took down all the time.

For the cost of a new fill valve.... As long as you're capable..... Easier to replace rather than 'maybe' fix it to then fail again.

Is a 5min job with a spanner & sponge.