Compost tea is not a replacement for compost. If the soil structure is adequate already and just in need of more beneficial organisms you could get away with not using compost. Otherwise, I would topdress with compost (lab tested if you're buying it). I know some people selling compost locally have some really poor products, that's why you ask for the test results.
As for a "microbe spray," I would be extremely skeptical that it could contain even a fraction of the biology in a well made compost tea. You just can't give these beneficial, aerobic organisms an effective shelf life.
And finally, you will need to make sure the biology is there before adding nutrients such as protein meals to the equation.