I would love to get a dog but at the moment it is not possible. Maybe my new neighbour will have a dog that would visit me so at least the doggy scent may deter some critters? The 28 possums that I trapped last year didn't get released back into the wild because they are territorial and letting them go in enemy territory is against wildlife protection advice. All native animals here are protected and you can't cull them without a licence so I can't say what happened to them without implicating myself.
I will have to wait and see what the new neighbour plans to do. I think you are correct, Arturo, that he will be wanting to control the possums just as much as me so perhaps he will take over the greater burden of possum patrol.