Waiting for the heat-switches to arrive, I found a plastic 130°C switch on an old battery, so I pushed forward with that one.

Rewinding the 12V coil was boring as expected, and because the wire already had bends from the initial winding, the result was not aesthetically pleasing. But a lot of insulating wrappings cover it up nicely, and it looks OK from afar.

And it delivers about 12 Volts!

Another item not yet ready for the scrapheap: