Drinking/grain ethanol will work better than acetone and IPA. Maybe vodka would work, dont know if it would leave a taste (for changa or whatever). Ethanol is not the best but quite better than acetone or IPA. The best solvents for harmalas are more toxic, like methanol and DCM. If you use them, make sure its properly dry before using (better let it soak again in some non denatured ethanol and let it air dry again for many hours to help getting rid of traces of those solvents)
Regarding what purges said, vinegar will turn harmalas into acetate form. Some people have experimented with smoking what was previously dmt acetate that was evapped on water bath. The theory is the dmt acetate will turn to dmt freebase with heat (not above 100 degrees C). The smoke from the resulting product is psychoactive. But, other people (like amor fati) who have extensive experience smoking acetates decided not to do it anymore because long term it felt unhealthy, there was some weird nauseating aftertaste. Its unsure whether this was because of some vinegar impurities or because of acetic acid itself, maybe not all evaporates and converts to freebase and when people inhale the smoke from this, maybe the acetic acid ions are damaging to the lungs.
Why do you need to dissolve harmalas?