Another vote for Shavemac.
The Morris & Forndran Brushes have Lee Sabini custom hand tied knotsShavemac (I really like D01), easy and excellent. Declaration Grooming knots are nice but large - they will custom make a knot for your handle but I think only 24 mm or larger. I find the B3 hair is excellent - but I do like some scrub. Probably ridiculous, but Lee Sabini used to make good knots. I’ve no idea if he’s still active, he was extremely aloof even when he was actively selling stuff.
They are probably all Chinese sourced hair but selected and knotted elsewhere.