@Cyprus, although your ideal is essentially a super-sized Sultan with blue eggs, I would argue that you are better off keeping too much true Sultan blood out of it. I would not breed back to pure Sultan after the first cross, as that can bring size back down.
I like
@Dona Worry 's idea of finding Brahma with the vulture hock defect; I'm unsure of how successful you will be in sourcing enough to begin a programme like this, but definitely worth a try to start asking some Brahma breeders if they have any rejects they are wanting to cull.
I would be using Araucana for this, as they are both crested and bearded, with a pea comb and blue eggs, but you do not have them in the US, so that's out. Ameraucana would be suitable, as they have the nice small pea comb and beard, and, again, blue eggs.
As to the crest. Houdan, if breeder quality, can be nicely sized; they were originally bred for meat. They are crested and bearded, and lay a white egg, therefore will not alter the blue.
If you can put vulture-hocked Brahma over each group of hens, then breed the offspring together, you should find that all your desired traits appear in at least a few birds. Then it's just about refining so that everyone has all of the desired genetics and is pure for them. It'll take a while, but larger offspring will come sooner with larger parent stock, and it will keep the hocks in there without breeding back and back to a small bird.
Just be careful not to breed them too close; it can bring down size, as well as reveal other undesirable and sometimes unpleasant characteristics. I would want several groups, similar to a clan breeding system.