There's absolutely no way I would do this on a new car personally, particularly this one. Aside from the very important issues already covered here (warranty, metric/english units, cost, hassle, etc.), there's two others I'd point out.
First, you might have a hard time selling or trading the car when and if you go to do it. Even if you do everything legal and honest, many buyers will likely be concerned that you didn't. There are "grey market" cars (real or imagined) where loopholes or bad paperwork have been used to do things like roll back odometers. Not sure where you are in NY, but living near-ish to the border I've had to sign things on trade-in stating that my trade-in is not a CDM car; dealers have also offered and/or given me paperwork stating that a used car is not imported. Not because there's anything wrong or substantially different with CDM cars, but rather because in the process the car might have been title-washed somehow.
Second--why are the '18 R's being held at port? It might be because of some i-dotting or t-crossing with emissions. If that's the case, I suspect it wouldn't matter if it's coming from Germany or Canada, either way the car would be held at the border until it's certifiable. So you might go through all that hassle and cost and still have to wait.
If you really can't wait, I'd just find the most-lightly used '17 you can, they're out there.