From what I can tell, it might take more ‘trial and error’ to configure, but here are posts directly from each provider…

• Mullvad tips: https://mullvad.net/en/help/connecting-to-mullvad-vpn-from-restrictive-locations
• iVPN tips: https://www.ivpn.net/knowledgebase/troubleshooting/i-cannot-connect-from-china-or-vietnam-or-iran-or-russia-etc-what-can-i-do/
• Proton needs Tor: https://protonvpn.com/support/does-protonvpn-work-in-china/ (but might be worth exploring Stealth mode)

I’m sure one Stacker will be better placed and have direct experience though.