If you let the wood dry you will be able (more easily) be able to peel the bark from the wood, with a twisting motion.

The idea is to get as smaller  pieces as you can then zip it up in a coffee grinder to powderise so as much surface area is exposed.

Throwing all the wood into the brew may produce unwanted oils but no problem with a few re-x.

Patience is a virtue.......   with Acacia  (my only option here), is softly softly  chatchie monkey.....

I have some Acuminata phyllodes extract freeze precipitating as we speak.  Good luck