Shellite works just fine. Test yours by letting a small amount evap and see if ANY trace remains ... Acuminata is best with an A/B.... (Vinegar and NaOH)
Once the bark is removed try to grind it as small as you can. This is best done with dry material in a coffee grinder.
I have no idea about mixing MHRB with it, dont get it in these parts....
Good luck
G
One can never cross the ocean without the Courage to lose sight of the shore