The Barnstormers Tour years ago, it could be 10 or more years ago, did have a rule which penalized a team in which a pure RP went over a set amount. I want to say 200 IP but my memory is not what it used to be. Maybe someone else playing the tour that long will remember the specifics.
I do remember this MM.
That was WAY back - I'm thinking ATG2 or ATG3 when the Woody Frymans, Bugs Raymond and Willie Hernandez cards were the one's to have......and Eck was a $7 mil card R1.
To SIMPLIFY things, just created a special "SHUFFLE DECK" for any Tour league with $100Mil or less caps and take those cards out. (The Sutter's, Murray's etc...).
TSN will do that pretty quickly.
No monitoring, no "ethical" issues.
Easy peazy.