Ok yes, the S/C is linear in rate (assuming a +ve disp. charger) but the fuel map may not reflect this. There are many things than can cause an engine to run rich or lean and simply giving more fuel with more boost makes for a very risky proposal!
You will also have to retard your ignition to prevent detonation., and provide some sort of temperature compensation. It is because of things like this that most of the turbo conversions you see run an aftermarket computer.
It will also be very expensive to find the right sizings (if you could...) as it would mean sitting on a dyno and changing injectors and AFM's to get the right combination!
If i were you i would abandon the idea and just get an aftermarket ECU. It will be far cheaper, run better, make more power and use less fuel!