Please correct me if I'm wrong, but shouldn't various buff trackers be able to accomplish this? The way I imagine this to work is basically:
1. Enable the display of ability IDs in your preferred buff tracker.
2. Transform.
3. Note down the buff ID of the transformation.
4. Prominently track said buff with the aid of its ID.
Note that I have no Werewolf of my own to test this with, so if I'm making zero sense, that's probably why.