Walkera receivers aren't really popular with people using deviated transmitters. PBR called them "overpriced and feature limited". For example, the LemonRX 10-channel Rx is $25, with the satellite Rx, has UART output for quad/uav applications.
You'd probably be better off asking in a Walkera-specific forum or a general RC forum.
Do not ask me questions via PM. Ask in the forums, where I'll answer if I can.
My remotely piloted vehicle ("drone") is a yacht.