I'm sorry to say, currently the answer is no.
It requires an external script being run on an external server. We don't want to use eMule's, thus we'd have to implement our own, that runs on amule.org. But at the moment I don't see sufficient developer capacity to do so...
So, unless someone contributes a working script that I can install on amule.org, the port tester feature won't be implemented in the near future.