I have been hatching wheatens too, along with blue wheaten, blue, black, splash, self blue and then some white bantams with our daughter.
I almost pursued the isabel project a few years ago since I raise both the wheatens and self blues, but decided I was best served trying to improve the varieties I already had.
A color variety acceptance process is exciting and rewarding. The ABC had the self blue color variety officially approved in large fowl January of 2020. It is so exciting that it is approved after years of feeding the self blues as a project color.