all i can say is if you can find a rf20 at your local walmart ,target, tru etc go for it i havent found one where i live yet and if you dont like the rf20 you can always go back to get magstrike becuase they are normal at all the stores if your getting one ofline thats a diffrent story.
This has been discussed in the <IRC CHAT LINK> IRC channel several times, only moving the magstrike or an RF20 mechanism into a vulcan shell where it would feed the belt and fire in place of the electric motor... Its quite possible but also not warworthy unless you machined new parts.
These threads are generally extremely erotic, as the ideas people throw out here are often ridiculous and impractical. Just use vulcan belts with your vulcan and magstrike clips with your magstrike, there's no need to make such and overhaul.