The Medalist was a fairly expensive camera in its day. The sheet film accessories made more sense in a world where an investment in a Medalist tended to preclude having enough other money to buy another, sheet film camera with all the necessary lenses and accessories.
If I had the kit, I probably would have fun with it, but I wouldn't go out of my way to add a sheet film option to a Medalist.
Anyone here who has shot with a 6x9/2 1/4 x 3 1/4 view camera will most likely tell you that working with that small a ground glass isn't the easiest thing to do.