This is the problem.. you're allowed stuff mounted on the seatpost though. I think powerpod could work that way. I don't know the options for track bike crank power. I suppose the other option is Garmin vector but I like SPD-SL.
A Powerpod has to be mounted on the front of the bike - it's effectively a wind sensor that back calculates power rather than measuring it directly with a strain gauge. I'd find something else TBH
I think your problem is that you already have a strain guage PM so you won’t be able to do meaningful comparisons between the data from two.
Also trackies aren’t mad about having stuff attached to bikes on their tracks, right?