Bro, guitar center garage will even do this at some locations. Installers for things like this are a dime a dozen, any guitar tech should be able to. Why would you want it installed anyways, isn't that a little like when you called us copycats! Just kidding, but any skilled tech can do it. Good luck.
I didn't know the fernandes sustainer was steve vai's signature, did he make it? did he patent it? is he the only using it? lol
like I said before, I'm fan of vai's as the next guy, but I would never copy him to the last detail, instead, I would rather implement some of his tricks and gear, while still retaining some originality of my own, such as different guitar, different amp, effect pedals, etc
I know for a fact, that there are many here who want to copy vai to the extreme, those are copycats, ironically, even after copying all his gear, they don't even come close to his tone