Forum:Destiny Hero Dragoon and Substitutes?

I'm currently using a D Hero Dragoon Deck, and I was wondering if The Dark Hex-Sealed Fusion and King of the Swamp can be used when fusioning Dragoon.

A friend said (mainly because I know he hates Dragoon with a passion) that since you can't use substitute monsters with Cyber End, and Cyber Twin, and Chimeratech, that you MIGHT not be able to do so with Dragoon.

I DO use Prisma, but I only send a Dragoon or Dogma with him. Is it legal to use a new-named Prisma and a substitute monster?