True. I was more trying to think about what could have been done to make this nice piece of kit safe without a major change to the board. About as important, what I might do if I bought one to make it, and the required components, safe to have in modular form.
If I read correctly, L1 and L2 are the only connected wires, and will happily take in anything from 90-264VAC. My interest was, what could be done internally, without changing the board, to make it take any properly wired plug adapter, or at least make a properly wired plug adapter for any reasonable outlet drive this unit safely.
Thinking more, I guess a 240VAC only, no neutral, circuit might cause my relay idea to fail to work. Perhaps a 240VAC coil across L1 & L2, again SPDT to flip between 120VAC and 240VAC.
That still means a specific leg has to be connected, not just any random hot. Attached is a schematic (hopefully reasonably correct on symbols) of what I am thinking about.