I've been trying to find some way of getting my QD sling swivels to work on my PRS stock. I ran across this company that makes exactly what I needed. The make a QD bracket that replaces the one on the PRS stock. I just got one in the mail yesterday and it's very well make, mounted up just fine, and works great, problem solved.
http://cascadiaarmamentdesign.com/store/
http://cascadiaarmamentdesign.com/store/