No I’m afraid not. I reached out to Fimi but so far no response. This unfortunately means that discovering the protocol will require some snooping of the messages sent from the FC to the gimbal.
I’ve decided I’m not going to pursue trying to get AP onto one of these two drones. Instead I’m looking at an open design for a small copter based on parts from AP Partners (where possible). It won’t be quite as small and cheap but it will gain support from the various manufacturers I’m sure.