From my reading around, it seems that Phalaris brachystachys is the key species here, a nice clean alkaloid profile, and mostly pure DMT, and apparently, lots of it. I've got seeds and will be sowing them in a few weeks. Then one can extract the juice with a wheatgrass juicer...
P. aquatca may also be a promising species, but alkaloid profiles may vary a lot between species...may be worth getting hold of an already assayed clone.
It still seems to me that Mimosa is by far the best spice source, although growing one's own sustainable, fast growing, and very subtle, regenerating DMT source does have its attractions...