I have not done this on an 0411 PCM, but FWIW, this is the basic 2 bar MAP hack that had been used years ago when we didn't have custom OS's. I know for the old LT1's (EE hack version of PCM's), this was the way to do a boosted setup. There will be a slight difference for the 0411 PCM, but in general your theory is correct.
To keep this a low cost DIY solution, I would do the 2 bar MAP hack and call it a day. As others have stated, if you want to go with an elegrant solution, then EFI Live and HPT's would be the best route.
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