I dont think you can change the actual badges of national teams anyway, only with club teams...also as far as i know nobody has posted a download with the national teams PNG pics for importing to the fronts of the kits so yeah, like souvlakimike said an option file is the only way you will get the national kits done for ya right now.
I tell you what tho...I would definitely appreciate those national teams PNG pics if anyone has em coz the national teams editing is the only thing i really have left to finish.