how to change the settings of a watchface with only bluetooth (no internet connection)?

hello,

if i travel to an other country i can't access the parameters of a connect-IQ watchface without paying the internet connection?

when i just want to change the settings of a connect-IQ installed watchface (just to change the color for example), the bluetooth connection is not enough.
The watch is detected as connected and the number of installed watchfaces is displayed but i still have to activate the data network (4G) to access them.

I could understand that it is required to check updates or to display the store, but if i just want to change the parameters of my already installed watchface, then a bluetooth connection only would be sufficient if the watchface was stored locally in the cache memory of the application. Otherwise why a data connection is required?

Even the picture preview of the watchface can't be displayed without the data connection.

thx