Just an update for anyone who may find this thread searching for the same answer in the future (lol no pun intended).
The Future sanded just fine with 2000 grit paper. I even added a couple drops of water to the surface for good measure. I sanded very lightly, wiping away the residue with a microfiber cloth until the paper towel fibers were gone. Unfortunately, this being only the first or second light coat (pre-decal) of Future, it was quite thin and although I had a light touch, sanded through the paint a couple of times. I just masked, re-sprayed the color and followed it with a fresh coat of some more Future.
The end result was good, you can't tell there was ever an issue in the affected spots. Thanks for the feedback guys, and anyone else who happens to read this and is wondering, you can sand Future and it holds up well and subsequent coats really evens out the finish again pretty quickly.
Cheers.