no I don't know those in particular, I have 2 Hangar9 mechanical retract models and even though they also have a locking feature in the retract system.
I still would be ultra cautious with battery drain possibility make sure there is no chance of a loss of control from battery running down, sounds like you are dead set on using the servos on hand, I personally would not use them, but thats for me to decide.
I have a ARF Hangar9 mustang on hold waiting for a retract servo so you know where my personal position is.I use Robart and Century jet air retracts on my kit built warbirds so servo operated units I have limited knowledge, but I have read allot of information and have some idea of what I am telling you, and am just passing it along