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High heat is one of the ways PCBs are reprocessed to constituents. Given the energy cost to make long chain molecules it seems a shame to spend energy breaking them. I think it might be better to not make as much in the first place and make kinds which are thermo-mouldable to repurpose

I believe you are referring to a fusion torch!

https://en.wikipedia.org/wiki/Fusion_torch

It would work, but we can do much better than brute force. What you’re describing is how I’d turn the Moon and Mercury into a Dyson swarm (as the mineral extraction part of a clanking replicator), but I suspect that even in that example someone who only just managed a chemistry BSc could do vastly better than anything I can imagine.