So if you are still not sure HOW to perform the extraction:
Maybe do some regular A/B with a defat step - most other plants have a high fat amount and only Mimosa Hostilis does not require this step.
So cook the shredded bark,
Extract other fats with Hexane (or maybe a stronger solvent like Xylene/Toluene/DCM/Ethyl Acetate),
Basify to pH >11
Extract with Hexane.
But keep in mind that the solubility of 5-MeO-DMT is not that high in Hexane - you will need more solvent than compared to DMT. It is only slightly soluble in boiling Hexane, therefore make sure to pull with Hexane at 65 °C or higher.
If you get some results, but with bad purity, you could add another FASA step:
Dissolve whatever is coming out from your Hexane pull in Acetone/Isopropanol/Ethanol/... and add a solution of saturated fumaric acid. Wait 1 day and collect the precipitation, dissolve this in a minimal amount of water and basify to pH >11 again.
Now pull one last time with Hexane at 65 °C and place the Hexane in a freezer. That may improve the purity. But thats just from a hypothetical view ...