You probly could get away with using those nutrients. For the simple reason you'd only have to apply them once a month.
at probly 1-tsp per foot of branch growth.
actually the (P) in the NPK is for flowering. I use triple Phosphate 0-45-0 for my flowering. You need to keep in mind there time released nutrients, so it takes a little while for the plant to pop.
chemical nutes are chemical nutes, like fox farm or general hydroponics there chemical nutes. So I don't see how your chemical nutes could be any worse.
dont go crazy, try it once a month in the soil and see what happens.