Set a clock as default from outside the settings?

Hello,

Is there a way to set the default Clock (Settings > System > Clock) from outside the settings? Typically, from a "Set as default" menu in the clock itself.

My understanding is that I just need to update clock and clockHasWidgets the settings.json file, but is there something else? I noticed that when changing the clock from the settings, the watch shows Updating boot0...

Thank you for your insights