I'm not sure there is any Transmitter that has multiple memory that needs rebinding.

Think about the RX that you just bound. Does it have any way to know if the TX is used for other things when it's not in use? And the TX memory is there to have the right settings for each plane. So if the TX is set for the right model, the TX-RX pair should work right no matter what the TX has been doing since they were bound.

You bind the RX to the TX after all.