Ferghis
Explorer
The only one that seems remotely interesting is Barbed Armor for brawlers:
The other properties don't seem worth a proficiency slot.
This is better than the feat that does Dex mod damage when someone escapes your grab (possibly unless you've maximized Dex, which is rarely the case for a brawler).Barbed: A suit of barbed armor or a barbed shield is covered with spikes and hooks designed to injure creatures foolish enough to grab at it.
While you wear barbed armor or wield a barbed shield, a creature takes damage equal to 2 + onehalf your level when you escape that creature’s grab on your turn or when that creature escapes your grab. If you wear barbed armor and carry a barbed shield at the same time, the creature takes this damage only once.
The other properties don't seem worth a proficiency slot.