I know this isn't what you want but if you just wanna roll w/having a "fixed idle" you should just buy a freddy cheapie b/c they actually believe it or not hold a decent amount of psi and then hunt for what you actually want. They all have the same 2 bolt pattern.

Or, you just need to take like 30 pain in the ass minutes and adjust your bov to get the perfect idle and blowoff function. G/L