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That kind of jubilee is mottled (recessive gene) on a base of black laced red (red, brown, gold--whatever name you like to call it.)

Crossing to other Jubilees of course works.

If you crossed him to a Dark Cornish (black double-lacing on red), you would get chicks with some kind of lacing, and no visible mottling. Crossing them back to the Jubilee would produce about 50% mottled chicks. (Similar for just about anything else you cross him with--that was just an example.)

If you want to see mottling on other base patterns/colors, you can look for pictures of Speckled Sussex, Spangled Russian Orloff, Millie Fleur, Ancona, Houdan. I'm guessing that even on black, the mottling will provide reasonably good camouflage.

It looks like the Dominant White is a bigger problem than the Extended Black, so you might breed away from it first.

I don't know how carefully you control which male mates with which female, but if at least one bird in each pairing has no Dominant White, you should see a lot less white in the next round of chicks. If you let them all run together, it would probably be easier to select enough males without Dominant White, rather than trying to find enough females that lack it.

To identify birds without Dominant White, look for black in the plumage. Not just a few feathers, but black lacing or black tail or black all over or something like that. (For this purpose, blue is just as good as black.)

For these project-males you posted pictures of, the first and second have Dominant White, the last two in a photo together do not:

The Jubilee Orpington and her son do not have Dominant White--you can tell because they have a good amount of black in their tails, and a fair bit in other places as well.