Oven Box Decora Plate

Sometimes it is really, really, really hard to find a good double-gang box at the hardware store.

I can find a million of these 4 11/16 wide boxes though, which are apparently used for wiring ovens? They're great, except they have no provisions for holding outlets.

This plate will fit on the 4 11/16 box and hold a pair of decora outlet whatevers. NOT FOR USE IN HOUSE WIRING, I hasten to mention - I am using this as a project box, so I can incorporate a ground fault interrupter into somet