Or do it in two runs, divide in two containers.. I wouldnt reduce a basified solution. It might be a little heat like 50c is ok, it seems DMT boiling point is quite higher than that according to some nexian's experiments, but heating freebase alkaloids is in general not a good idea (possible more oxidation and therefore low yields if you use naphtha), or maybe the other trace alkaloids can vap or degrade into something unwanted, who knows..
I think better that you go for the safe and bigger work of doing it in two runs, or as nen said, re-acidify. Though to re-acidify lye, you would probably need tons of acid, way too much vinegar, so it would be better if you had HCl (all safety precautions when dealing with strong acids such as HCl apply, also careful with nasty HCl fumes..). I think I would just do it in two times with the amount you have now.