Flash point and ignition temperature are two separate things.
What's wrong with waiting an hour or two anyhow?
Other ways of speeding up evaporation:
*Increase surface area
*Increase air velocity
*Increase temperature
*Decrease air pressure
A rotary evaporator or a spray drying apparatus would be among the better ways of evaporating a solvent.
As regards your second question, yes a strong enough base will precipitate an alkaloid from water so long as the alkaloidal freebase is not particularly soluble in water. That's a pretty fundamental element of how DMT is extracted. It's not simply a question of the solubilities at various pH's, rather the degree of protonation of the alkaloid concerned.
This kind of information is covered in the wiki.
“There is a way of manipulating matter and energy so as to produce what modern scientists call 'a field of force'. The field acts on the observer and puts him in a privileged position vis-à-vis the universe. From this position he has access to the realities which are ordinarily hidden from us by time and space, matter and energy. This is what we call the Great Work."
― Jacques Bergier, quoting Fulcanelli