Interesting you should mention a sych release as I was thinking of the same sort of mechanism but didn't put it in my reply. Such a release could be very usable as often it's not that folding blades are strictly necessary but the ability to move them is if they can't be folded. One can get quite a fair number of machines in a fairly small space when combined with castoring wheels. The ability to attach a [portable electric] ground dolly to one or more wheels or having motors in the wheels (though that would add weight) might make such dense parking a one or two person operation.
Bob