Just a thought Shane, may be worth your while checking with Ian if the wottys on board BRC can be disabled and then fit one of these...
http://www.dimensionengineering.com/ParkBEC.htmhttp://www.dimensionengineering.com/ParkBEC.htm
I have found that most controllers with on-board BECs cant produce more than 100ma @ 5V, Your RX will pull around 70-80ma then your battle switches pull 30ma each (it dont take much to get to 100ma!)
I use them in all my machines and being rated at 1A+ it could quite happily run the RX plus any number of battle switches you may wish to add at once with no probs!!!
The one in P.I.T.A runs the TX, 2 battle switches, mixer board, logic side of 2 Victors giro, giro switch and it doesnt even get warm!
I swear by them.