This is exactly the issue, Richards and Brassard are not going to work on the 3rd line at all, which means one of the two will have to play wing.
Lindberg/Miller can hopefully win a job as the 3rd line guy. But I think Boyle will take that job as he is certainly the best face off guy.
Lindbergh as a 4th liner isn't terrible though. And I believe you need two centers on that third line.
So for me the lineup is
Kreider, Stepan, Nash
Richards, Brass, Zucc
Miller, Boyle, Cally
Hags, Lindberg, Dorsett
The biggest problem is how tiny that 2nd line is. But maybe you swap Zucc and Kreider? If you play Pyatt on that 2nd line where do you play Zucc? The 4th line?