Brian, I have been researching this myself for my own performer project. I think the option you had in mind is to replace the valve on the tank with the current version and get it recertified. From here you would need a hookup, hose and NPT fitting to go onto the existing regulator, or replace the regulator as well. It's pretty simple but you will need to piece the parts together at a hardware store.
Alternatively you can use a regulator from a Q which has the valve built into it, but this way it would only accomodate the disposable propane bottles. You would also need to fabricate a bracker to hold the regulator in place.