Hi Doug, there is a tool called EMT
http://www.flightsim.ee/products/migration-toolIt´s a worth while tool to purchase for under 20 bucks. It installs Carenado aircraft in a jiff as well as other FS products...and from reading the fourms on the net it will install orbx PNW and SAK, but I am not going to give it a whril untill ORBX comes out with a migration tool from FSX to P3Dv2 which is in the works but, maybe will have some issue with people flow feature which I can live without for the time being...eventually installers for P3Dv2 ORBX programs.
Here is a thread from ORBX showing P3Dv2 in action with programs you mentioned...they look tasty to say the least.
http://www.orbxsystems.com/forum/topic/70146-p3dv2-ftxg-ftx-sak-pajn-rex-4/ as you can see hope is out there.
I am stuck on P3dv2. FSX these days is not the same after flying in the P3D environment. I have FTXG1.20, REX4,Carenado aircrafts, AccuFeel and A2A Cub installed. I am keeping the FSFaith that soon ORBX will provide the tool to get me back in RTMM flying and with any luck all the RTMM sceneries will work as in FSX.
Hold your horses, this hobby never stops... I just purchased ORBX Vector.