I wouldn't use neem 3 weeks into flower, but I am a huge fan of no pest strips, check the active ingredient, it's my screen name. Use neem in veg. The no pest strips aren't really gonna do much with alot of air moving, but at night, with the blowers off, they do the trick. I used to use 2 in my flower room, they are a godsend, but it takes time for the pest killing shit to build up in the air, hence the night time effectiveness. Your trash can plan sounds good. Your mites better be afraid.