If you don't have any luck with these suggestions, open an issue on the GitHub page and I'll help you debug the issue. I can't think of any reason it shouldn't be possible for this controller to be supported.
I might just do that. My pro-controller works with my wiimote with mission control, so it can't be the wiimote with a faulty port. To test the drum outside of my switch my only option is my wiiU but I don't have any taiko games on there. I don't think there is an option to test the drum on the wiiU outside of the game either unless there is a method I don't know of. It was working before I got my hands on it, so I don't think it could have broken that fast. Opening the drum test on the switch I get no response. And I don't think I'm being stupid and ignoring the fact there is some alternate way to turn the drum on, it should just plug into the wiimote and work like any nunchuck. If you could help me debug this in github that would be great. I'll open a report in a few minutes.