I think that if you use the KrZ protocol, everything is going to be just fine for you.
There are literature references on exactly this reaction available in J Med Chem 44(23), 3881 (2001).
KrZ: Tryptamine -> DMT
Tryptamine hydrochloride (10 g, 62.4 mmol) and sodium cyanoborohydride (6.28 g, 100 mmol) in a mixture of methanol (400 mL) and glacial acetic acid (11.76 g, 196 mmol) were cooled to 0C in an ice bath over a steady stream of nitrogen. A solution of 4.20 g formaldehyde (140 mmol, 11.05 mL of 38% Aq. CH2O) in 125 mL of Methanol was added dropwise to the solution over a period of one hour with mild stirring. The flask was stoppered, the reaction allowed to return to room temperature slowly, and allowed to proceed for the next 60 hours. Upon completion the pH was adjusted to 8.0 by the dropwise addition of an aqueous solution of sodium bicarbonate. The mixture was then extracted 4x with 50 mL of ethyl acetate. The combined extracts were washed once with 250mL of brine and dried over MgSO4 (15g) for 15 minutes. The MgSO4 was washed clean with another 75 mL of ethyl acetate. The solvent was reduced to 100 mL on the rotary evaporator. The hot solution was added to a 200mL beaker and covered with plastic wrap which was sealed on with a rubber band. Upon cooling in the freezer overnight, the precipitated DMT was removed by filtration, and dried in the dessicator.
Overall yield: 7.88g, 45 mmol, 67%. The mp is solid, right around 64-67°C.
