For the R33 people, I think the best thing to do is get one of these R32 actuators on your car, and then mod the factory bleed solinoid so it's on all the time (there's a DIY thread about doing this).
So you should get the (new) stock boost of 10psi with the R32 actuator, and have the factory solinoid bleeding off to bring it up by 2psi = 12psi
Total cost would be just the R32 actuator, and you'd have the benefits of everything looking totally stock standard
J