please someone correct me if I am wrong , but I don t think that making a copy of an hypersonic should be that difficult... maybe time consuming but not that difficult. 2 ways:
1/ bring it to a shaper who will be able to make templates to replicate scoop, outline and concaves.
2/ there may even be prototyping shops ( not necessarily windsurfing companies, just a company that specializes in digitizing items for ex) with a 3d scan -> bring the board there, get a 3 d model made, then get that to a shaper that has a 3d numerical lathe (ideal). You ll get a blank that is a perfect replica, you ll just need to get a shaper to strat the board properly.