I imagined working like this:
- on the app, “My Devices” tab, have a place to choose a second time zone
- on the app, “Screen Customisation”, have GMT / Dual Time option
- on watch, selection of GMT shows second time zone on the digital display, with a icon and a number, meaning time zone 1 or 2
- long press switches time zones between analog and digital display, icon number also changes.