Yes, a roll film adapter would be allot easier, if you can get one for your Busch Pressman.
A note on this my Speed 2x3 has a Graflex 120 roll film back, but also accepts the RB67 roll film backs. There interchangeable between the two camera's, so it might be something to check into.
I have cut down color roll film to fit my 2x3 film holder for a quick test.
An other solution is from one sheet of 4x5 film, you can get two 2.25 x 3.25. Be sure to clip the edge of the second one, so you have a notch to inform you which side is the emulsion.
From 4x5, I also cut sheets down to fit the 9x12 or the 3x4, for use in two other of my camera's.