Brendan, it would cost you no more than having a 96' spec 2 complied. Most of the modifications to meet ADR's are standard for specific makes, and therefor the cost is the same.
Although it did have quite a few aftermarket items, this can be taken care of in a few hours before you go for your blue slip and third tier inspection ..... it's only the visable items they'll pick up on, hey I managed to hide my turbo timer and boost controller which live in my ash tray, just by putting the front cover of the ash tray back on with some blue tac !
Things like gauges you can take off, BOV's you can tighten, POD's (mine didn't get picked up ?), hide any wiring for aftermarket items behind the dash, borrow a set of swap rims off a nice person in the forums and your set to go .....