Sounds like you have a good grip on it already.
In any case I'll offer my own view:
I wouldn't defat the dry plant material, seems like you'd need tons of solvent which the plant material would trap, maybe you could decant/filter part of it but part would be absorbed/soaked.. Seems like a very innefective way of cleaning up. In fact I wouldn't defat at all since you're anyways gonna work with FASI, which precipitates the alkaloids away from the fats, that is essentially defatting and way more efficient without all this loss solvent.
Maybe it would work fine to just reduce the liquid and base that with calcium hydroxide but it sounds like potentially a problem to me. DMT is stable in acidic solution, but once you reduce the solution more and more, small particulate material starts to form in the brew. If you filter that out, you're probably losing alkaloids because it seems there's some alkaloids there (just like precipitates in reduced aya brews have alkaloids mixed in). If you dont filter and base everything together, it might be fine, but be sure to test with small amount first (and/or maybe do a side by side with another pot with the plant material mixed in with the base so you compare yields if youre up to it).
Also a couple more details, between step 6 and 7 maybe making a sodium carbonate wash is not a bad idea, or at least let it stand for a while before adding FASA so you can decant it away from any water droplet that may have come across with the limonene.
Also between steo 18-19, I've found that first leaving some hours at room temperature and later going fridge, improves crystallization.
Be well, and dont forget to tell us how it went!
PS: Feel free to write an intro essay so we can properly welcome you into the community