mopar performance valve covers wtf...?

I picked up a set of mopar performance valve covers on the cheap..here is my quandry. both covers have twist on caps. I would prefer to run a pcv set up. Is there anyone out there that has done this? I did find a set on ebag that looked like a solution..I should have known when the person selling them new does not accept returns... shocker...anyone else find a solution?
You can knock it out from the top with a punch then clean hole with rat tail file. Maybe drill out with right size hole saw.