Kinmera, wyandottes have rose combs, not pea combs. They are small but totally different structure than a pea comb.
x2 If you look close you should see the leader on the back of the wyandottes rose comb that you won't see on the pea comb of a sumatra.,
There are some blue sumatra breeders in NY. If you are willing you could wait till this fall and go to the Ohio Nationals and see them in person.
Dsfango (sp) on here is breeding black to blue which would give you black and blue offspring. From there you would just need to cross two blues together to hopefully get some splash. Breeding blue to blue gives you blue, black, and splash offspring (splash being the lesser percentage of the three colors). Once you have splash you would breed them together to get only splash offspring.
I'm sure others could help out with more information. Good luck.