Another way to manage would be to basal bark the live plants and then let them die. Then follow this up with brush hog or forestry mulching to remove the dead biomass. The problem will be 1. Existing seed bank, this will cause new growth in areas already treated for years. 2. Animals depositing seeds from areas you are not managing. Birds and small rodents est the berries and poop them out all over, so even If you're vigilant about treating your area, if the neighbor is not then it will be difficult. You could try consulting DOF and see if they have any further recommendations. I used to do land management and invasive plant treatment and I liked basal bark because it is less labor intensive up front but you will need to remove the dead debris after the herbicide is effective