That is a great idea Compound boost. This is not a hack
The benefit, besides having easy to get stock parts, is that you can basically ignore the inefficiencies of the turbo and the supercharger and still arrive at higher boost levels.
So if the the stock turbo car ran at 8 psi and the supercharged version ran at 8 psi you will run at 16psi without maxing out the turbo or the supercharger's efficiency.

