[morzh]

This radio has one of the stupidest arrangemens where no matter what you do it's bad.

If you cannot touch the chassis then it doesn't matter much, especially considering it was unpolarized in the first place.

Now with polarized, if you route Neutral (wide) to the switch your chassis becomes hot (I didn't study the sch too close so I assume the GND symbol is chassis). Whch is bad.
Do the opposite and your chassis becomes hot when the radio is turned off.

So.....same thing, doesn't matter.