Your US editor should be able to move from FCP to Premiere Pro without much difficulty. There are even FCP (version 3) shortcuts that are available in Premiere Pro. Basic functionality is the same between the apps (j,k,l,i,o, etc.) I find that most editors have no problems moving, though there are some differences.
That being said, if you finish FCP, you can capture your clips to Quicktime and then export your EDL. FCP should be able to read it without much difficulty.