"You should put in a feature request for Reaper."
I put in a request to Reaper for it to play wma files accurately, they did that very quick after some testing and sorting out it plays on an old Celeron 5400rpm laptop with no issues. The only audio app that uses this wma format for their content is PG. Reaper had it rendering wma but then they took it out as they said it was too old and there are better formats now.
All the fake time signatures that go over more bars are not much use in the Plugin.
If you could set different time signatures in the Plugin and it would adjust the tempo accordingly to adjust the bar timing to align with the daw.
"In the meantime it might be simpler to set it to 4/4 and use the same tempo, rather than trying to do tempo gymnastics."
The "meantime" has been from the 90's. I think that was the original decision PG made as an after thought to give greater time signatures without reprogramming as the horse had bolted.
If you had real time signatures would you get users saying we don't want that, we want them spread over bars.

This is set to the same tempo: