Ability to "send to all channel" in expression map

Context:
Instrument tracks only, using expression map to switch midi channel

Problem:
Expression map does not broadcast to all channels, which is intended but inflexible when it comes to multiple similarly-keyswitched patches

e.g.
1 kontakt instance, 2 choir patches, 2 midi channels, both using the same keyswitches for words

In this scenario, one cannot use the same keyswitch to change the words of the two patches