Tri-spokes etc

The Specialized I have is for a cassette.
Makes it more difficult.
Just seen this:
http://www.hedcycling.com/cart/accessori­es.php
Wondering if it's possible to replace it with a front...

If you can change them, then surely.....?

I dont think you can do it with the specialized tri spoke. From what I've heard The hed track conversion kit isnt compatiable even if you want to use it as a rear. Is it a shimano cassette hub?