I don't know if it's still there, but there WAS a late model front spoiler on Ebay.
If'n I reccollect properly the late model spoiler is a 3pc job. mounting the sides with 3M tape probably won't be sturdy enough to hold. The shape of the side pieces does actually make a little downforce, therefore drag would pull of even the strongest glue. As for the center section, I'm pretty sure it will bolt on & line up on a standard hatch. For the all glass job the factory drilled holes, & I would too, just so I didn't lose a REALLY hard to find piece.
But totljeep I'm diggin your car so far. The interior looks familiar to me, but in a whole LOT better shape LOL