I’ve been stock-piling electronics that either people throw away, or things I bought 2nd-hand only to find they are broken.

Looks like the right to repair law is in very slow motion. Not yet enacted be the European Commission. And once it is, member states have like 2 years to actually enact it in their law. Probably even more time before consumers begin to see results.

(edit) I think some US states were the first to enact right to repair laws. So some consumers could perhaps pretend to be from one of those states to demand things like service manuals. But parts and repair is likely more out of reach ATM.