Flgpwn allows you to add any flag to your pawn.
Add (hat#hFxx) to your name. Replace xx with a two-letter country code that you can find here. Use CTRL + F to search for the country.
To use Everypower with Flgpwn, use (hat#EphFxx), replacing xx with the country code.
These flags do not have a two-letter code, so you can use the full name: