FWIW I was able to take a sliding back apart---it's a normal 5x7 back attached to the larger--- and fit it to the camera. It wasn't difficult and, IIRC, the operation would be reversible if need be.
Take the sliding back off and study it, you'll see where the 5x7 back attaches.
All it took was a screw driver or two---this was on a gray Agfa 5x7 ---to dismount it from the part it slides on. You may need some brass "L"s for the outside corners where it clips onto the camera body but I was able to scavenge them from the old back, I think. This was several years ago
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