There;s a reason why cold water extracts on MG are part of the tradition, and that could extend to being a reason for NP washing the seeds before making a tincture. You could use medical grade 'benzine' (not benzene) for this. Other than hexane, pure n-alkanes are relatively harmless. Alcohol isn't completely harmless either, remember?
Speaking of alcohol, evaporating 95% ABV will not leave behind the 5% water since alcohol forms an azeotrope with water that evaporates without leaving the water behind. This is why distillation of water/alcohol mixtures will not go above 96% ABV. Your evaporation will leave a 1% water residue at the very most.
“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