Some of the older Rolleicords don't have "hidden" shutters (they're mounted right on the front like a folder), but they may still be a PITA to remove. If all you want to do is unscrew the elements out and screw yours in, you can do that. The bayonet mount doesn't make any difference, the elements should still unscrew like any camera. I took the elements out of a Minolta Autocord and screwed them right into a Rolleicord. Unfortunately, it wouldn't focus to infinity. That's the problem you're going to run into on these conversions. The film to lens plane differences are probably going to be quite different. If you want to play around w/ different lenses, a small Graflex camera (not the larger 4x5 models) might be better because they have long bellows that can accommodate these differences.
If they're too big for you, maybe a tube camera like an Agfa Isola. I had one that I took the original lens/shutter off of, and put on a much "better" Solinar from an Isolette, w/ a shutter that ran to 1/400. I was able to get around the difference in film to lens plane differences by epoxying a shutter nut to the outside of the tube to make up the differences in length. But you couldn't collapse the tube anymore after that, and to tell you the truth, I've come to appreciate the 3 element lenses more than the so called better 4 elements anyway. They're sharper in the center, and just have a look that I like more than the more modern lenses.
Nowadays I have a regular Isola, but shoot mostly Holgas and Dianas. From 5 element Heliars, to 4 element Tessars, to 3 element lenses, to single element cameras. I like the images better from the simpler lenses. Next is a 4x5 pinhole.