Looks like we'll be able to use Verndog's weight plate along with the Diggity lipo holder. Just put a washer or two under the mount holes of the holder and that should be enough clearance. It shouldnt affect clearance between the lipo and top deck as your are just raising the lipo holder.
Better yet, how about a stainless steel lipo holder in the same shape, maybe a little thicker and hit 2 birds with 1 stone.
Now, if there was only a way to get everything as a complete combo packages...........