have you considered spinning them?
YOC Dirty Diamond Tek - THCa isolation from Crude
that would get you much of the way…without added solvent.
you might also try putting some a canning jar of warm water and shaking the shit out of it, the hte should float. the crystals should sink. decanting may be tricky but the goal is not to redeposit the HTE on the THCA during pour.
the hotter you go, the better it will work, but at some point you reach melt and then decarb. neither of which you want. I’d start in the 45C range. the smaller stuff will be more prone to melting. but you shouldn’t see that till about 65C.