Maybe before doing this I would try a sneaky shortcut:
DMT freebase in water will float on top if you have a huge amount. It will do even more when you heat the water a little, best case above DMT melting point (> 60 °C).
Now sadly not sure about the efficiency as you also have some alcohol inside. I would only create Changa with Aceton, evaporates much faster.
In any way:
- put herbs out
- warm the water to > 60 °C
- put into container which is TALL but SLENDER
- put a little bit of Naphtha on top
Now with some luck a big amount of your DMT will float on top of the water (does not mix, density is below 1 so collects on top) and directly migrate into the naphtha if it is molten (that's why heating to > 60 °C).
Then evaporate or freeze precipitate the naphtha.
Maybe that might be worht a try before completely dispensing the DMT in a huge volume like 1 L by adding the acid