I don’t know if you know Rudluff’s Inking bundle, from @fizzyflower’s gigantic MyPaint mega bundle pack, which in my eyes is a fantastic bundle, not much comes close when it comes to ink and line art. You can either try to find it in fizzyflower’s post where it’s in one of the archives held there, or take the shortcut and download it here directly.
Furthermore, many are convinced by Jarry H.'s Line Brush Set. Already the number of those who found and downloaded it via the post hidden in the depths of the forum is impressive, because nowhere is it advertised, I guess most found it via Google. But these brushes are also more than worth a look, even if you’re looking for something else.
Whether you’ll find what you’re looking for in the aforementioned bundles, I can’t say, but you’ll definitely find some very good brushes among them.
I’ll keep my fingers crossed for you in your search. Good luck and success!
Michelist