you can place a buildout resistor of 4K7 inline with the hot (center) leads of both legs of the "Y".
I figured there was
some sort of audio equivalent of a check valve out there somewhere - thanks for the save...
What about if I unplug the non-active component from the electricity outlet? Will it help?
The danger I see there is Murphy's Law - one instance of inadvertently having both plugged in at once, and you're back to the place we're trying to avoid.