There is another option: On Samsung Android phones there is the Secure Folder. This is protected by the Knox Platform which has security approved by DoD among other entities FWIW. All apps and data stored in the Secure Folder are encrypted and can only be opened with a pin or biometrics. You can hide/obfuscate the Secure Folder by renaming it and burying it in your games folder, or even making the app invisible and accessible only by searching for it. Place all your LN/BTC apps that need to be secured into the hidden and renamed Secure Folder and then revert to option A and hope for the best. If you are not China's shit list, they will likely not mess with you too much. Had a friend who recently spent a month in China and had similar concerns, but no issues whatsoever.