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I add 1 Tbl /gal of soil mix of each as well as crustacean meal. If you're growing organically and using microbes, the crustacean meal encourages the microbes that break down chitinase which is found in crab shells. Chitinase is also found in the exoskeleton of many bugs so those microbes can act as an insecticide in your mix. He also adds kelp meal but I use my KNF version instead.
Coot's original recipe calls for 1/2-1 cup of each of them per cubic foot of soil, or roughly 7.2 gallons. I never need that much so I scaled it down to an amount useful for me. His base mix is 1/3 each CSPM, aeration, and compost. I've never used Promix but my understanding is it is CSPM based, and if so, you should be fine.
And I don't know about substituting the liquid version of neem in your mix. Maybe adding some of the concentrate with your water so the plant takes it up? Not sure. @bobrown14 is our resident Coots expert so maybe he can weigh in on whether you could substitute liquid neem concentrate for the dry neem meal in the mix.
Thank you, Azi. I found this article, which seems to indicate I could use oil or powder.
Stop Bugs Eating Plants