I guess you could design an environment of controllers that
transmit sysex messages,
I think many of the main synths have already had this work done. You can try Len Sasso's webpage www.swiftkick.com for free downloads. Maybe there are some other downloable environments too. Come to think of it I need to look for one for my Novation Nova.
(Also how do you have Logic and not have a dongle? You do legitimately
own your software don't you?)
Do the Log Express owners have dongles too?