How about restricting the air before the SC
one of my winter projects, is to try to integrate a drive by wire throttle body before my standard throttle body.
the megasquirt has boost control targets related to engine rpm and throttle position. it outputs a pwm output based on initial settings, but will modify the pwm output if the boost is higher or lower than the target.
the throttle body, has a motor with a spring on it, and 2 pots (like a tps) which provide position information.
I am working on a small uP to convert the pwm to position.
I originally considered the blow off valve, or the possibility of controlling the sc bypass valve. Either way is fairly complicated, and I figured I would have a better chance of success with the controlability of a throttle body.
In my case, I have room for an additional throttle body, and have purchased a rather large one, since I don't want to restrict the intake in any way.