Redundant BEC's ?
Might want to try looking into a bus tie circuit:
Watch the video.
A guy in another thread on RCG (nageotte) makes these up for $10.00 ea.
Allows the use of a linear bec with a separate ubec. Fail safe up the kazoo!
If one fails, the other one takes over. I bought 2 of them . One for the Mossy and one for the new P-51