Welcome, freya!
I know other much more qualified people are going to respond to you, but I wanted to suggest two things. First, could you talk to your tester and have them write a letter using words to describe your DS's scores? From the charts I've seen on Hoagies, your DS's scores are definitely considered EG or PG, and hopefully your tester could convey this fact in a letter that would allow your DS to receive state resources. Second, since your DS did hit so many ceilings on the WPPSI, perhaps you could see if extended scores could be calculated. I don't know much about the specifics, but hopefully someone here will chime in.
Welcome to the board -- I look forward to hearing more from you. It sounds like you have an amazing DS!