There is no easy way to do this as the option isn't easily accessible via some config/script file or stored plain in the database, nor is there an option. You could start a JIRA issue requesting this if you have a good reason. Also, your mobile users will also need the desktop version to be able to edit custom fields that use their own renderers.
I have multiple projects that use variations of the same base workflow. The variations depend on the requirements of the project or issue type. The variations mostly come in the form of new statuses ...
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