This is nearly the same problem we face at our church, but we have need of outputs to multiple devices at FOH, Recording unit, Hearing assist, and audio to several remote video monitors. We have no choice but to add an RM16ai stage box in the Tech Booth, giving us separate control over each output via the 8 XLR outs on the RM16! It looks like we are going to end up with an RM32 and RM16 on stage (1 stage right, 1 stage left) and the RM16 in the booth. Not a cheap solution, but very effective! Good Luck.