I'd prefer it be known who is on either track (randomized - you still have to vote for vanilla or PR track blindly but you will know either way), but have the Mafia pick who is on the track the previous Night (including Night 0 - this requires the Mafia to know who is Vanilla and who is a Town PR - scum could WIFOM here).
Honestly idk, random elims are kinda frustrating, maybe just have a track with two, and a track with one and some powerful information (like a Cop result) decided by scum. The setup as is is very scumsided.