Going off memory of the standard tek dissolve it in vinegar to water 1:3 then add salt equivalent to 100-120g per 1lt of water leave in the fridge overnight to crystalize. You have harmala hcl.
You could also dissolve it in a solvent and crash it out with an acid of choice then filter.
Wiki has a list of solvents FB harmala is soluble in, you can dissolve the FB harmala then using an acid crash it out. Citric, furmaric, hydrochloric acid, phosphoric acid, maybe sulphuric acid should crash it out so long as the harmala acid form isn't soluble in the solvent as well (most shouldn't be).
Ethyl acetate and n-Butyl acetate seem to dissolve freebase harmala well especially if the solvent is warm. Citric acid can crash it out of EA/nBA (harmala citrate is slightly sticky). Furmaric should work well and form a non sticky crystal.
Acetone and furmaric may also work?
Gold and red? Not too sure different salt forms or impurities?
Edit: Misread the e-liquid part, not sure all the salts I listed are safe for vaping.
Disclaimer: All my posts are of total fiction.