Recovering land from allelopathic trees

In southern Brasil, it is common to see monoculture forests of Eucalyptus and pine. I've been told, they are grown for lumber, which surprises me as I would have thought there are faster and better quality trees. Anywho, I've been hunting for cheap land down here to start Keyline repair work and food forest planting and it is common to find large sections of the land for sale, covered with either Pine or Eucalyptus.

How challenging is recovering land from allelopathic trees? I'm sure its worthwhile from an ethical and biological perspective, but I am still learning this stuff and would prefer to avoid adding extra challenges in the beginning whilst I gain experience. Would it be better to cut my teeth on pasture or heavily ploughed land or biocide filled ex-farmland?

If land that contained allelopathic trees isn't too challenging, then my goal would be to harvest the trees at maturity, clear the land, keyline rip it, build a dam and swale system (if appropriate) and plant a food forest with legume ground cover and then periodically chop and drop the nitrogen fixing plants for green mulch. How does one clear the allelopathic bark and needles? Should they be burned (there is no biosphere to be preserved and concerned over)? Or is there a more useful function for allelopathic biomatter, making it worthwhile harvesting the bark and needles?

Cheers