I would not spray anything on flowering plants, no matter how safe the spray claims to be.
Neem oil is banned in my country for use on any crops intended for human consumption, so I would not be smoking the stuff!
Anything you use will take 2 weeks to work, then with a 2 week witholding period.............thats 4 weeks..........probably about the same time until harvest.
At this stage, you might be just as effective wiping the leaves with a damp cloth to remove as many mites as possible, perhaps even wiping the leaves daily.
This will at least reduce their numbers to a point where damage will be minimal.
The other alternative is to do nothing...........I have seen buds absolutely wrapped in webs, but once harvested and dried, still smoked up well.
Mites will suck the sap from the leaves but leave the buds alone..........it looks ugly, but the leaves get removed anyhow.
The mites will remove any webs on the buds themselves, there is no need to do so yourself.