They were spending a lot of money to extract marginal agricultural products from soil that wasn't well suited to monoculture, and some eccentric estate managers decided to stop spending the money, and allow the estates to "re-wild": no more shrub pruning, earth-moving, etc.
One of the "big ideas" they had, which might be useful to you, is to reintroduce "mega-fauna" to their ecosystems (in their case, ponies, "wild-ish" bovines, pigs, goats, and deer. They found that these fauna did an excellent job of pruning the wilds, but they had a new, second-order problem in pruning the fauna; they'd like to reintroduce wolves, to do the culling for them, but can't for somewhat obvious NIMBY reasons. :)
They're at the point where the estates more or less run themselves; they mostly make income from selling flowers, culled remains, and ecotourism. Anyways, all this to say that you might consider leveraging some organic automatons to do some of the "extensive pruning" for you. Herds of goats in particular are very efficient pruners, and they can pay for themselves.
Sources (great reading/listening): https://www.newyorker.com/magazine/2020/02/17/can-farming-ma... and https://www.econtalk.org/isabella-tree-on-wilding/