My plan is to upgrade Logic later this year to the most current version (with Mainstage). I am currently using Logic 7 (which predates Mainstage). What I'll do is get it all set up on my desktop, and then transfer it over once I'm satisfied that it will work on the gig.
Hopefully this means I can breathe easier for the next couple of years! This year has been a tense one for EWI playing!