May be barking in the wrong forest here, let alone up the wrong tree but what happens if you install the VJOY plugin?
The reason for asking is having removed VJOY I was unable to map a trigger to activate Say Intentions ATC, re-installing VJOY sorted that out as it seems to communicate to third party software so it may be what you need.
As to why I removed VJOY?, couldn’t see what it did basically and the documentation wasn’t very clear so experimented.
ps: Xplane 12 user here, almost ordered the Moza before learning the FFB function wasn’t released for XP.