Perhaps an addition to the front of the holder to move the dark slide forward a bit. That would thicken the holder and necessitate relocating the ground glass again. A big advantage to a custom back is you wouldn't have to modify the camera or a holder, so you preserve the option to shoot 12x20 film/dry plates/paper negatives in the future. Also, most custom backs will accomodate a variety of plate sizes, so you could have it built to take 12x20, 8x20, 12x16...
And yeah, it's tough waiting for a new camera, especially something as epic as a 12x20.
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