Go to System/Library/Frameworks/AddressBookFramework/ABAddressFormats.plist.

ABAddressFormats.plist is I believe a binary plist, convert it to text format, and you may add any other country to any subgroup, by following the same rules used for any subgroup country.
Use SSH and paste your edited ABAddressFormats.plist, restart your iphone and you will see now your country!

ENJOY