"possibly in code violation"

HAHAHAHAHA. Anyone who has to even read the code to know not to backfeed like that should not be allowed near screwdrivers. Some people make such a good case against universal health coverage, like Tim the toolman Taylor.

Also, why not just use extension cords ? At least it's kinda safe. You only want to power certain things anyway. You wouldn't power a jacuzzi or central AC that way, but you might want to power the furnace if it's gas. That and the fridges/deepfreezes. After that you got maybe a DSL router, some PC maybe or charge a laptop, charge the cellphones. Cordless phones. NOT the 55" Pioneer.

By the time it's all said and done, you're best off installing a separate box and rerouting what you consider critical supplies to it. You can interrupt it there just fine, and I'd bet there is a ready made product just for that. (lol)

Do it right, unless you have enough lumber in the attic for a new house in case that one burns down.