For particular reason I don't like to look at that flag anymore. So I hacked my keyboard layout, changed it's name, flag and added missing Ukrainian-Cyrillic letters to it.
- Copy 'Cyrillic bilingual.bundle' into '/Library/Keyboard\ Layouts'
- Go to Keyboard preferences
- Click on '+' to add new input source and select 'Other' submenu
- Find find and choose 'Бандерівська' language from list of input sources
- Feel like a hero and enjoy typing
Glory to Ukraine! Слава Україні!