0.02
I designed my own WVO heating system and I take a different approach and it has worked well for me, 60K miles and going.
1) I always fused direct power from the battery, anything over 8A.
2) For a switched 12V, I open up the fuse cover, solder a 'small' wire to the fuse bracket and connect it to a 30A relay. Just pick any window fuse. There are other fuses to choose from. Run a suitably rated wire to the battery and you have a switch 30A circuit.
3) No need to remove any panel or clamp it with any existing wire harness, will not overload any circuit as the relay only takes mA.
4) If for any reasons that everything need to be removed, just unsolder/cut the small wire and no one will know you have been there.
5) You do not need to be nimble, young or a contortionist to install it. You need a soldering iron though.
Good luck.
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