At Chinese border crossings, when you become suspicious, it’s only a matter of time before you reveal your password. Officials will torture you to extract a confession. In China, if your phone contains Telegram, VPN, Singal and you have criticized the government, the consequences of being discovered are more severe than a duress password, and usually depend on the mood of the official at the time.
If you are in this situation please, and I repeat please do not bring you in danger and try to avoid any harm.
Just buy and Samsung A phone and use it a while and let the pixel stay outside the border control (e.g. don’t take it with you).
For your data that you need in China. Upload everything to Proton drive (e.g. Signal backups, telegram backups etc.) and then login on proton and download the data securely (internet café with tails or something else.