An expensive but functional option is to enable roaming on a foreign eSIM. Getting an eSIM is relatively easy. Roaming mobile traffic is routed from the country in which the SIM is from, not the country that you're in, meaning that an eSIM from e.g. an American carrier will not be subject to the censorship in your country.
I've used this on multiple trips to China over the past decade (including a trip last year). You can find carriers that will charge very low (or even no) roaming rates.
Data-only eSIMs (e.g. ones you get from Airalo and apps like that) are not going to cut it though. You need a "full" eSIM that gives you a real number and even then, it's not a guarantee that your traffic will be routed via the country eSIM is from. Tello does route (or rather, exit) via US for example, but it's 2¢/MB.
Chinese forums / blogs have a lot of information about this stuff. I usually ask ChatGPT to translate "Research topic re: some form of circumvention and give me forum posts and blog posts about it" to Chinese, then paste that into DeepSeek with search enabled and just let Chrome translate the responses. Does a really good job. At least better than what I can manage with Baidu.
I don't know if these work or not for the specific case mentioned here, but the cheapest eSIMs by a huge margin are from https://silent.link/ if anyone is interested. They definitely do work under normal internet circumstances.
You can go way cheaper than that – https://esimdb.com/ has a good comparison of options. I’m usually paying sub-$1/GB in Southeast Asia currently.
Wow, that is crazy. These prices are hard to believe.