If you use a RG731BX receiver and you put it in XBus mode A as shown in the Gyro's users manual page 23 you will NOT loose the normal PWM outputs from the receiver. Only if you switch the receiver into XBus mode B you will loose the PWM outputs from the receiver !?!.
I decode the JR XBus protocol in my ASSI devices and I use Mode A for this and the servos on the PWM outputs on the receiver are still working (TX is a XG14)