This would probably work. I can bypass network filters by just running my own OpenVPN on standard VPN ports, because it only blocks known VPN servers and performs no packet inspection or port blocking. If that's done, you might have to use TLS- port 443- then hope the deep packet inspection doesn't get you.

Ultimately they want to go for the low hanging fruit with little effort. Blocking common VPN servers takes a few minutes to do and maintain. Anything more and you've got to spend real money on packet inspection on possibly an entire country's bandwidth.