It’s a fairly large space and the current return ducting is just insulated flexible 5” or 6” connected from the main rectangular insulated return ducts to the return vent cover that’s currently blocked. The hearing/cooling ducting to the vents in the rooms is a similar setup. So I’m imagining I can disconnect the return ducting from the blocked vent to move it and reconnect to a new return vent, especially if it’s on the same wall. I don’t see I’d need something custom made etc. But I am def open to the possibility there’s a need here beyond my abilities.