I think the cocowet, if anything, would be the issue.
I pre-mix my neem and simply shake the bottle very time I go to use it... seems to work.
I'm not sure that the wetting agent/surfactant is particularly important for a neem oil product to work. I'd be more concerned with a spreader/sticker if I were using the mix as a foliar feed and needed a very even application. With neem, you'll be misting lightly, allowing to dry, misting lightly the next day, and so on until you see a slight glossiness.