I'm using the M8 with Spektrum Module, and SR3500 micro receiver. You can bind the receiver to it, and then if you change model it will go to another different bound receiver. I'm using it for my TC5 and Shark, with two different receivers on the one radio.
No need to rebind when you turn on and off if you keep the same model selected.
My brother has the DX3S (similar to DX3R) and the process is the same. Bind for the model, then switch model on radio if you want to use a different receiver which you bind.