I suppose that means OpenVPN and SSH are too secure for the Chinese government to eavesdrop on. PPTP, on the other hand, has been known to be insecure for ages.
So... could you avoid detection by passing an SSH tunnel through a PPTP VPN? Add enough layers, and the censors might not bother to unwrap all of them.
Given that most US websites are now over HTTPS, breaking PPTP won't actually give Chinese government much information to eavesdrop on. They may know that someone is accessing Google or Twitter, but they cannot know the actual keywords or tweets they are reading.
Note that Chinese government does not have backdoor access to those US websites, nor do they control a significant fraction of Internet infrastructure.
That is why it is recommended to untrust every Chinese CA from your system. It won't affect daily browsing even for most Chinese users. The super majority of Chinese websites, even state owned ones, buy certificates from US companies.
So... could you avoid detection by passing an SSH tunnel through a PPTP VPN? Add enough layers, and the censors might not bother to unwrap all of them.