I'm thinking about a Graflex Reflex 3 1/4 x 4 1/4 that seems in good shape. Any way to use my 4x5 film holders or 4x5 Grafmatic on this camera . . .even if I lose some area to the smaller format?

I can envision a short extension box to adapt a Graflok back, but how could the viewing ground glass be managed to keep it par focal?

Any ideas that wouldn't keep the camera from being returned to its original condition?

Am I chasing a unicorn through the mist?