Variadic-templated class: support void without specializing the whole class?

I have a class:

template <typename ...Arguments>
class CSignalConnection
{
public:
    CSignalConnection(std::function<void(Arguments...)> target) : m_target(target) {}

    void invoke(Arguments&&... args) const
    {
        m_target(std::forward<Arguments>(args)...);
    }

private:
    std::function<void(Arguments...)> m_target;
};

I want to be able to declare CSignalConnection<void> and call invoke with no arguments. And I want to avoid specializing, i. e. duplicating the whole class, when I only have a couple void-incompatible methods (like invoke here which should be declared with 0 arguments). I have a couple more classes like this so I hate to write everything twice (and edit in two places).

One idea I have is to write both void and non-void invoke overloads and disable one with SFINAE, but I don't know how to actually implement this.