As said before, there is always the possibility that the occasional Mountainfolk would slip through Garlemald's grasp. However, given the nature of their Garlean occupancy (ie. military outposts built on their lands "for defence", the Garleans conditioning the Mountainfolk to believe they are there for their own good, the snowy plains of their homeland being near void of hiding places) it would be immensely difficult for one to escape, or even want to escape.
In relation to RP, I think there are a fair number of Garlean RPers and linkshells/Free Companies alike. So it shouldn't be too hard. (And, if your character is of Garlemald and in Eorzea, it's not like they're going to run around shouting "FOR GARLEMALD! FOR THE EMPIRE!", are they? You're likely to be a spy or some such.)
In relation to RP, I think there are a fair number of Garlean RPers and linkshells/Free Companies alike. So it shouldn't be too hard. (And, if your character is of Garlemald and in Eorzea, it's not like they're going to run around shouting "FOR GARLEMALD! FOR THE EMPIRE!", are they? You're likely to be a spy or some such.)
"There's nothing in this life a little charm and a solid fist can't get yer, lad."