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Do cross only once. Dominique as the rooster is ok because this way all of the cross chicks will be cuckoo- in fact leaky cuckoos, like the "crele cochin" on eggbid- come out cuckoo but at maturity the will get off color on the neck and saddles on roosters, and some brown lacing on front of neck and breast.
The easiest next step for creles is actually to breed back the cross chicks to pure welsumer. If you use a male over a welsumer, you will get birds with barring in both sexes.. if you use a female with a welsumer rooster, only the sons will be barred.. it's a sex linked dominant.
Should get a few birds close to crele coloring from this, if you are lucky and hit on a rooster and hen with good crele coloring(will have to hunt for birds lacking various genes from the dominique.. if dominique have Columbian, there will be barred birds lacking the black breast etc), you can just breed them together to get homozygous barred males. Then you're set... Can outcross back to a welsumer for new blood, or to improve on the color- there may be hidden genes in the dominique that mess with the crele pattern..
Breeding back to a domininque is a waste of time if crele is the goal.. that will just bring back more non-desirable color related genes.
BTW welsumers are not exactly pure red duckwing. The roosters are supposed to have a brown and black speckled breasts from a gene, can't remember what gene it is.. maybe Mahogany? However solid black breasted roosters exist and those would be best for being as close to crele type.. however the speckle breast roosters will still work for the general look, those will have a brown, black and white patterned breasts. I've done this with welsumers, and I did think the roosters were very beautiful.