How much experience do you have with hair sheep?
What you recommend may be appropriate for wooly lambs, but I never had the issues you describe with my Katahdins.
@I_don't_know, just this morning, DH and I were discussing getting hair sheep again. I sold mine off a couple of years ago because I was focusing on my dairy goats, and really didn't want to bother with the sheep.
That said, I now realize that the sheep were hardly a bother at all. Boring? Yeah. Bother? Nope.
They are hardy, and will both graze and browse. Parasite resistant, easy keepers, and delightfully mild meat.
IME, sheep will not eat a toxic plant unless they are starving. Also IME, there are very few toxic plants. Sheep, like goats, will eat hemlock, poison ivy, brambles... They're pretty handy to have around.
We fed them the same things as the goats, with the exception of copper bolusing. But they do need some copper, so they also got the same cattle minerals with higher copper content.
I really want to get sheep again. DH is sorry the subject came up. LOL