Not sure where you got your info but it's incorrect as far as I can tell. I haven't heard of this species containing 5-MeO-DMT, but stem bark did yield a bunch of indoles and other things, including 0.045% DMT, 0.0027% N-acetyl-NMT, 0.0035% 2-methyl-tetrahydro-beta-carboline, 0.0027% tanakine, 0.003% tanakamine, 0.0004% 3-formylindole [that's all the indoles], 0.00025% tembamide, 0.0005% N-(p-OH-beta-phenethyl)-p-OH-cinnamide, 0.004% 4-MeO-2-quinolone, 0.001% 4-MeO-1-methyl-2-quinolone, 0.0025% 4,8-dimethoxy-2-quinolone [edulitine], 0.0003% physcion [a laxative anthraquinone], 0.0017% syringaresinol [a cytotoxic lignan], and limonoids [0.0007% acidissimin, 0.0017% obacunone, limonin and methyl-deacetylnominilate]. A bunch of coumarins have also been found but not sure from which plant parts - haveb't yet dug out those primary references.
[sources: MacLeod, J.K. et al. 1989. “Acidissimin, a new limonoid from Limonia acidissima.” Journal of Natural Products 52(4):882-885.
Zarga, M.H.A. 1986. “Three new simple indole alkaloids from Limonia acidissima.” JNP 49(5):901-904.]
Even assuming you could separate out just the alkaloid you're looking for, there might not be much in there based on these earlier studies. That being said, plants can vary. I wonder what a mixed alkaloid extract of this plant would do to someone? Lots of things with unknown human pharmacology in there. Be careful whatever you decide to do...