IDK if its possible, but putting dry ice IN your naptha could cause precipitation of dmt carbonate via gassing of the solvent. Might be wrong there though, carbonic acid only exists in solution iirc, but you hear reports of mesc freebase being left out salting to the carbonate salt from co2 in the air, so idk.
Putting the naptha/heptane in a dry ice/alcohol bath definitely would be one of the best ways to precipitate out fb, and both are fairly easily accessible. If you have access to a freezer though, i think its just over-complexifing the freeze precipitation. An advantage though, is that its so cold most/all of the dmt would precipitate on the first freeze, rather than have to evap the naptha down and freeze again to get the last bit when using a freezer.
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