Might be prudent to be aware of this for next time:
Regarding the issue - there’s unfortunately no fix or workaround as you’ve mentioned. Our control system is configured when the app is launched, so it detects all connected controllers to your device at that point. If a controller is then disconnected, it will be “lost” by the app for the remainder of the app session.
We’re aware of this not being optimal. Far from it. And our intentions are to rebuild this system that would fix this issue, but we can’t say when that will be unfortunately.