I think you're smart to see what you have with the Smithies then maybe set up a second pen to do some experimenting with the culls from your better line. Also smart to get a few other folks on board to have some back-up flocks out there to draw upon if there are problems that arise on your...
This is a very interesting idea and should be well-received.
I was talking to a lady just the other day who has some cemani eggs she got from a friend and asked about color--apparently there was more red than expected in the parent stock. I do recall reading that there are different qualities...