Mimosene is some sort of toxic alkaloid found in M. Pudica which makes it hard to isolate the dmt because the a/b extraction pulls both of them out. All three times I tried extracting it in different ways, and all three times it produced this gross-looking toxic goo.
I don't believe there is any DMT or DMT-related compound in Mimosa Pudica. In my quick search just now, some sources are saying none, others are saying there may be a small amount -- I would just try a different plant that has a higher concentration of DMT/5-MeO DMT and none of that mimosine. https://wiki.dmt-nexus.me/DMT#Mimosa_spp.
And is 5-MeO-DMT specifically what you want rather than N,N-DMT? There's definitely a difference between the two, 5-MeO being an analogue of DMT. I'd assume you're aware of this if you're planning to extract but just clarifying in case. Anyway, I cannot help you with extraction but I do believe Erowid still has extraction methods listed. The process for DMT and 5-MeO should be the same, but there should be extractions for both on there.