It is unlikely that Hoppe would support the idea of voluntary socialism, at least in its commonly understood forms. He might argue that any attempt to implement socialism, even on a voluntary basis, would eventually lead to conflicts with private property rights and individual freedom. In his view, socialism is fundamentally incompatible with the principles of liberty and prosperity.
However, it's worth noting that Hoppe has also discussed the concept of "private law" societies, where individuals and communities could establish their own legal systems and dispute resolution mechanisms outside of state control. This idea shares some similarities with voluntary socialism, as it envisions a society where people can choose to live under different rules and norms, as long as they do not infringe on others' rights.