Switching SC14 pulley - positive manifold pressure & brake booster vacuum questions?

[Futo_gt86]

Car - KE70 Wagon

motor / part in question - ST20V, GTIR intake, SC14 & Razorback ECU.

problems - Switching SC14 pulley with Razorback ECU, Positive manifold pressure and brake booster

occurs/started when (if applicable)-

personal situation (if applicable)

Hey all,
So my razorback ECU manual says that it has an output for VVTi/Supercharger.
I take it means 1 or the other, not both....and that is it set by RPM
My plan was to retain the stock VVTi, so I am wondering on how to switch the supercharger pulley......
Like I could just literally put it on a switch, meh don't really like that idea.
Or piggy back a relay off the VVTi rpm setting....meh kinda shit idea
I would like to trigger it with TPS%.
Is there a way of at say 75% Throttle to trigger the SC14 clutch?
I am thinking of calling Sam from Razorback and asking how to go about it, or if I can send him my ECU to add this option or something like it.....
The Stock GZE ECU triggers it off HG readings right? like 8HG
So could I hook up some kind of a pressure switch to the plenum or a vacuum line?

Also been looking at this pretty closely and wanted to ask a few questions

Just trying to wrap my head around this, if I 'T' together brake booster lines form 1&4 and run that with a 1 way valve to my brake booster I will still have brakes with positive manifold pressure?
Or do I use vacuum tank? How does a Vacuum tank go when positive manifold pressure enters the equation?
Everything i have read about vacuum tanks is for low vacuum with big cams, can't find a thing about boost applications....
Or do i go for an electric vacuum pump?

I think I think too much
Thanks,
Ali