ok makes sense - sorry don't know anything that can do this elegantly - I'd probably go for either the vpme.de pwr & a 1hp gap (not big enough really for other things to fall through) to thread the ribbon through or a separate power supply with a wall wart, or a separate case (a 4ms pod maybe) or try to find a replacement for the 112 would be my suggestions...
another option might be to find a builder who will build you the switch - you'd only need to be able to switch the +/-ve 12v - so doable on a single dptd toggle switch - ignore the 5v and hardwire the ground... parts are under 10GBP/EUR/USD including a panel (the switch and the panel being by far the most expensive parts) - no need for a pcb - a bit of perfboard would do it... probably someone would build you one for 20 or so... maybe try modwiggler music tech subforum (there's a list of builders in the stickies - you might find one locally) or on r/synthdiy here
tbh the hardest part is the drilling of the panel for the hole to mount the switch!
"some of the best base-level info to remember can be found in Jim's sigfile" @Lugia
Utility modules are the dull polish that makes the shiny modules actually shine!!!
sound sources < sound modifiers < modulation sources < utilities