Rollers are intended to help people develop perfectly internalized balance, so the bike does not wobble when they pedal. Your stabilization device could not interfere with this without degrading the utility of rollers.

It seemed to me that what was needed for people who had trouble with rollers, was an accident-catching device, so they couldn't fall and get hurt. I built a two-foot thick doorway that was only barely wider than the rollers, out of plywood and lumber. I then got extravagant and built a deck that covered the space inside the doorway, between the two front rollers, and of course the rollers were fixed relative to the doorway. At that point I stopped and never finished it. I work on it a little bit each winter. Someday it will be done, but I no longer have a ready list of people with bad pedal strokes who will volunteer. Maybe that will change.