Sounds like a good plan. Working independently for a few generations will make our flocks good candidates for swapping eggs or chicks in the future to enhance the genetic diversity. I have noticed differences in the black and lavender lines I bought from John Blehm 2 years ago. Neither lay without additional lighting, but the lavenders start laying sooner when the lights are added. The blacks take longer to ramp up, but easily out lay the lavenders over time. The eggs from the blacks are larger and bluer also. That is my reason for wanting to cross my newest silkied chicks over some of the pure blacks, to improve the eggs even more.
IDK if silkieds will ever become really popular, but if I can get them to survive and lay like the blacks, then I can market them easily. For now, I refuse to sell the silkieds to anyone that is not either an experienced breeder or a "crazy chicken lady" (you know the type, spare no expense to make the birds happy). First time chicken owners find them cute, but heed my warnings about getting roos and them not surviving well (at least the original strain). Actually, anyone that had kept silkie bantams successfully for a while would also be a great candidate, they seem very similar to me -- minus the propensity silkie bantam roos have for turning mean.