Separate the country 'field types' from the core into .inc files or/and dropdown menu list of countries

If you consider, separate the country 'field types' from the core into individual countryx.inc files
which is currently 'hardcoded' into the core. Separating will allow setting a new field on
/admin/content/types/venue/add_field wont have a long list of unnecessary countries listed on, if you consider there will be possible addition of countries in the future. A long list of radio buttons will not be a nice solution. If each country has its own .inc file the they can be eliminated and only necessary ones can be uploaded.
Alternatively or/and additionalally country selections can be dropdown menu of list of country fields

INSTEAD OF
o French postal codes
Textfield
o Canadian postal codes
Textfield
o US zipcodes
Textfield
o United Kingdom postal codes
Textfield
o Dutch zipcodes
Textfield
o Australian zipcodes
Textfield

↑↓ ZIPCODES or POSTALCODES
- French postal codes
- Canadian postal codes
- US zipcodes
- United Kingdom postal codes
- Dutch zipcodes
- Australian zipcodes
- x postal codes
- y zip codes
- Zimbabwe postal codes