They're working on something similar in Australia for Carp. Trying to work on creating "daughterless carp" which will in theory breed themselves out.
Very expensive though that kind of work and takes years and there are no guarantees. The problem with those sorts of things is the risk of non target species being affected.
I probably already said this but in Aus we're about a year away from releasing PAPP as a replacement for 1080 on pigs and dogs (foxes, wild dogs, dingos etc.). Doesn't effect natives i.e. your possums but could maybe work on stoats!
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