Thanks for the really informative post I have some Lavender Araucanas that I had been toying with breeding with some Gold Laced Barnvelders for fun to create what we would call a Glarc because as anyone who keeps chicken knows they do not Cluck they Glarc!
( Gold Laced ARuCana =GLARC) so even the F1s will be Glarcs! and I had already realised we would get Black birds from that cross.
However now I better understand what you are doing I may take that a few step further and try a bit of selective breeding as well who knows what I might end up with!
Go for it, good luck and keep us posted on that. I'd love to see the end result or even the progress if your open about your projects. If you think about it a lot of breeds could become an Isabel. It's just one more color to add to the spectrum and honestly I could see it becoming a standard in a lot of varieties eventually. And on top of that you you could have Isabel's twice or more in the same breed. Example being Golden Laced Wyandotte and Partridge Wyandotte. The Colors I study the most are Lavender, Chocolates and Blue. You would not believe the things just these three Colors can do. All the hidden potential that's there that just has to be dug up. Definitely my forte!