True. By the usual means: ie. moving a point heat source under an thermal insulator willy nilly and hoping it will diffuse the heat evenly.

My hypothesis is that dropping the material in solution onto a finely etched disk would result in the crystals nucleating evenly across the surface. The conduction interface would affect all of the DMT simultaneously, as opposed to melting large crystals, and bridging insulating air gaps. By specifically designing the geometries, you can make all parts heat evenly (enough), at any rate you want.

This would be possible to do across glass as well, but time is an important factor. The longer the vapour is sitting around in a vessel, or your lungs, the less trip you're getting(because of the limited ingestion window), or less DMT you will get out of the vessel because it will start condensing.