Yea, I’d just revert the entire setup to 5v DC, and get a 5v DC power supply - less than the voltage it was all designed for, and an led lamp. Or even go 12v and find a 12v led.

Pumping AC, 230v at that, through switching and wires meant for 12v DC just yells “I want a big nasty shock”. (Not that doing it with 120v would be any better).

I can only imagine the arcing happening in that switch