Hey I haven't seen a Lenz machine on the forum for a while. Thanks for putting up the pictures.
Does the windzilla have any "cogging" feel when you turn it by hand? If this is interfering with start-up then you likely have a bad choice of generator (don't know anything about the windzilla myself - I make my own PMA's) even though the specs of the generator do sound like it would work.
It could be just as easy to build yourself an axial-flux PMA than to set up a clutch. Fitting to the shaft, added bearings, tuning the counter-weight, there's such a long shopping list of things you would have to do to make that clutch work... so I recommend you just build a PMA that will free-wheel up to cut-in speed and eliminate the problem entirely.
Maybe another member of the forum has successfully mated a Lenz turbine to a windzilla (or similar) PM generator, so stay tuned; they might have another solution, but I doubt it.
Oh, and welcome aboard, captain.