How to add languages/regional settings without adding keyboard layouts in Windows 10?

I've found a workaround. I wonder for how long it will work, though: the Control Panel features get removed with each Windows release.

The trick is to set the regional format through Control Panel, not Settings.

1. Set up everything except the regional format through Settings:

   • Settings/Region
   • Settings/Language

2. Go to Control Panel - Region (you can get there via Settings - Region - Additional date, time & regional settings). Set the regional format there.

   • Settings/Region
   • Control Panel
   • Control Panel/Region

3. Additional languages won't be installed. This is the desired outcome.

   As a bonus, you can also customize the regional settings outside of the pre-defined options with Additional settings.

   • Control Panel/Region/Additional settings