No real way to use PCRs without using the old MSS. You are attempting to use the latest HCMPF content to run PCRs which isnt going to work.
HCMPF are also not something you can just "turn on" either. If you are thinking you want to upgrade from your PCRs, it is going to be a project in and of itself. Expect something in the neighborhood of 5-6 months.
The only thing I can think of to make use of your old PCRs in the new EHP6 is to create a portal page with the links to the old PCRs embedded and add that to your copy of the MSS role. Ugly to be sure and definitely not fully leveraging all that EHP6 and HR Renewal has to offer.