Yes, it's actually quite simple to do if you have the cam! Changed my 180 Elmarit II that had a ROM mount added. I had spare 3 cam mount and cams and swapped it back.
M6, 35mm Pre Asph Lux, 50 Elmar M
IIIasync, 5cm Summar, 5cm Sonnar, 3.5cm Elmar, 13.5cm Sonnar
Leicaflex SL, Leicaflex SL2, R6.2, 28mm Elamrit Ver II, 80mm Lux, 100mm Apo Macro Elmarit, 180 Elmarit, 400mm Telyt, 560mm Telyt