The app itself isn't very sophisticated though, so I had the thought of setting up keyboard shortcuts via BTT that I could then trigger via a shortcut button on the Quick Keys pad.
However, this doesn't work — the actions are never executed by BTT. Interestingly I can tell that the correct sequence is firing, because when creating a new trigger in BTT you can press the button on the Quick Keys and it actually captures/fills in the shortcut correctly.
I'm wondering if there's something in the way that BTT detects shortcuts where maybe it's missing the shortcuts triggered by the Quick Keys? I did try adding the higher CPU priority extension and that didn't seem to make a difference, unfortunately.
most likely their software is sending the keys at a too high level. It might still be recognized in the BTT UI, but not in the BTT background services.
Does their software allow to trigger command line or apple scripts? If so you could use these to control BTT
Ah, that does seem to work, although it's not super obvious. You use the "Open/Run Application" action in Quick Keys, and in the Finder window to choose an app you can change it to allow selecting any files instead of just *.app. Point that to a shell script, and that seems to work!
In that case you can trigger your BTT triggers via a terminal command like this:
/usr/bin/osascript -e "tell application \"BetterTouchTool\" to execute_assigned_actions_for_trigger \"6DBBA69D-4D80-4A12-9EAA-3CBC0160069E\""
(get the UUID by right-clicking a trigger in BTT)
Or if you want to trigger a named trigger.
/usr/bin/osascript -e "tell application \"BetterTouchTool\" to trigger_named_async_without_response \"The name of the trigger\""
Although it sounds a bit cumbersome.
if the software allow to open URLs you can also try to right-click a trigger in BTT and select the "copy link to activate trigger" item. However triggering via URL is not as powerful as via Apple Script because BTT will quickly activate when triggering via URL.
btt://execute_assigned_actions_for_trigger/?uuid=6DBBA69D-4D80-4A12-9EAA-3CBC0160069E