Recommend asking in the RCGroups DIY-Multimodule thread.
Deviation waits for an aileron or elevator stick movement to end binding (ignoring rudder). Looking at the multimodule code it seems to only exit bind on receiving a packet from the rx, or timeout waiting for it (but I'm not very familiar with that code). It also contains the following comment, which implies the mixers should be set up before binding.
/* Spektrum own remotes transmit normal values during bind and actually
* use this (e.g. Nano CP X) to select the transmitter mode (e.g. computer vs
* non-computer radio, so always send normal output */
