Why don't you pull off the vacuum hose at the TVIS actuator and vacuum plug the hose. Drive around to see if you like it or not before you gut the TVIS. I believe your having the 225 engine?
been looking around for an altezza this last few months..
(yup i know there some being sold in zth..)
some of the ones i've seen selling at the shops are bit run downed..(altho mileage...