Yes he can use neem, but it is slow long term, his time frame is short, neem will taste nasty if used within the last 4 weeks. The problem is the left over eggs. They will hatch and continue the cycle, which at this point is where the Neem breaks the cycle.

If you get webs, give up

I do understand the too much pain to get outta bed. Neem is not something you need to use every day, once a week is fine in a stable garden.