So no pics in my Bracken stuff. Some references to Keefer VZ-A, Beurling VZ-B = MH883 in early 1944, Ketterson VZ-K = MJ306 on March 4, 1944, Likeness VZ-W = MJ959 in May 44, also VZ-V = MH617 at same time.
According to the Spitfire Production database, MJ722 spent very little time on 412 Squadron before being packed off to a repair unit. I would need to look at the ORB a little closer to find out what caused the aircraft to be pulled off the squadron. The dates in the database don't jive with the ORB though as it shows up on missions past the date noted in the database. However, the early-mid July/44 on strength date jives with the database.
MJ722 was not a personal aircraft for Berryman as others are shown flying the same rig. Where are you getting your info from Geo? Are you trying to model the aircraft at a particular time or for a particular event?
In the meantime, I'll keep looking.