Good news for sustainability is:
The phyllodes of Acacia phlebophylla contain DMT, so it would not be necessary to remove roots or to harm the plant to obtain a useable part of it.
Acacia obtusifolia is said to contain 0.45% dimethyltryptamine in the bark and 0.3% in the dried young leaves, so it's possible to harvest leaf or possibly bark without harming the plant...
You are quite lucky to live in an area where's these plants are prominent. I have heard some amazing things about Acacia phlebophylla,
https://www.erowid.org/experiences/exp.php?ID=1769 the report in this link was reproduced in shorter firm in TIHKAL...every anecdote regarding his species involves something near a peak experience.
Your very luck to receive the cutdown tree, which can be used for extraction or brewed into a tea and taken with an MAOI, honor it's life by learning and experiencing all that you can.
I wish you the best of luck, it seems the gods have placed this plant in your possesion, and I can only imagine that you will have quite an adventure in your future.
-eg