Polish drivers licenses...would you be able to keep/use the enhanced American one [...] Or, how would one go about getting a permanent Polish drivers license?
U.S. driver's license is not valid in Poland. However, its holder can obtain a Polish driver's license after passing the theory test. To register for the exam it is necessary to have the U.S. license translated by a sworn translator. Such translation must include information on what types of vehicles the person is permitted to drive.