I kept a BWM flock for about 20 years, and at first trimmed regularly but as time went on I found it was not necessary. The outside horny bit grew over, and eventually under their clees, and then sort of dropped off. And I never had any foot problems except one would occasionally get some long grass stuck between the clees, which just needed taking out.
I am on wet heavy marl/clay with springs and nearly always had too much grass
They are excellent mothers, nearly always twin, I let the ewe lambs get in lamb with no ill effects, though they would normally have one large lamb so needed to be watched, otherwise pretty trouble free on the lambing, and the meat is excellent. I never fed the lambs but let them fatten off grass.
If I can myself organized I shall get another flock, and they will be BWM