I think a country like Australia could be a good starting point for smart guns. Yes, not a very big market-around 8% of US population, with significantly lower rates of gun ownership-but culturally more open to gun control, with a much weaker gun rights lobby, and a marked political tendency towards surveillance and “nanny state” regulation
IIRC Australia doesn't have legal frameworks for gun ownership for the purpose of self defense, and there's no great implementation of smart guns in the first place.
A smart gun is like an AWS authenticated motor twisting ballpoint pen. Just no one ever seriously pays for such a thing, and it has not even been seriously made if it ever was actually conceived. Making it a requirement is basically out of question.