Cynthia,
A lot of what I just shared with Jill applies to your situation as well. If you want to preserve/create a high quality Barred Rock line, and who doesn't? hahaha You and I love these barred birds and those older Stukel hens need to make some chicks this year. Something to move forward with.
Cyn, it's gonna be a three year journey. Enjoy it. I know I would. We need projects and I love projects. It's put in us by our Creator. We love being creative and we love a challenge. I love the challenge and i think you would as well. Why not?
Take your best male and put him over the two best Stukel females and make some chicks. Next year, change up the players and rinse and repeat. Have fun. These are going to be Barred Rocks. That's the goal. They are Barred Rocks not because of pedigree, as poultry isn't like horses or dogs. We don't go by a pedigree. We go by type. What we see. If in two or three years, you breed some stunning Barred Rocks? (and I think you can) that's what they are. If they look like Barred Rocks and fulfill the Standard for the Barred Rock? Then, that is what they are. Period. Breed them to the Standard and that's what they are.
"Pure" in poultry language doesn't mean blood line, it means what we see with our eyes. When they look like Standard bred BR, that is what they are, pure BR. No if, ands, or buts about it.
I hope you go for it!!!!!