Law / Drivers License USA citizen has EU Austrian License needs Polish [6]

I have a valid Austrian LKW Führerschein, am American citizen living now in USA. I am moving to Poland next year and I need to obtain Polish license. I know it is fairly simple to exchange EU license, BUT what about EU license held by American ?

Can someone call, when they get the time, to License Agency and explain the condition to see what can be done ?
Thanks
James