Added rate/expo switches and pots and a channel 7 switch to the Pro-Line Comp 6, stripped out the meter zener and resistor and installed the new LemonRx 2.4 module with an external bind button behind the aerial.
All worked fine and like the additional on-board componentry that saves the use of an external buzzer and meter circuitry.
The Lemon RF module is tiny and not much bigger than a digispark!