I remember that bridge, It was a generic bridge from the late '80's. I think Charvettes had those as well as series A and bunch of others (BC Rich NJ Series?).
I'm holding a Floyd in my hand, you would only need the deck routing if you wanted to pitch up. I would add the deck routing so you could flush mount it though, the action might be a little on the high side if it is sitting above the deck. If your neck is sitting high above the body, you might get away with it.
Is the stud spacing and the distance from the studs to the sadle break points roughly the same (withinthe adjustment of the Floyd?). I remember those bridges as having allot of plate before the saddles.