If you have Android, you should check out Shelter or Island (Shelter is open source, but Island is in the play store). It’s not what you’re describing, but it accomplishes something similar. It essentially leverages Androids ability to create a work profile to create another isolated profile on your phone. That profile can have spoofed, useless data fed to it or even just be disabled when you’re not using it.
If you have Android, you should check out Shelter or Island (Shelter is open source, but Island is in the play store). It’s not what you’re describing, but it accomplishes something similar. It essentially leverages Androids ability to create a work profile to create another isolated profile on your phone. That profile can have spoofed, useless data fed to it or even just be disabled when you’re not using it.