The beauty of studying phil/theo in other languages is that because of the rich intellectual climate of Continental Europe during the 19th century, I have a feeling most of the ‘terms’ are either cognates or at least have common Latin roots. The actual technical vocabulary might be less difficult than less conspicuous things.
The problem is, ICRSS isn’t quite a missionary institute and it is not quite a diocesan assignment, so if you are assigned overseas, I feel it would be hard to serve well in a European parish–their faith is already declining, and those that continue to maintain it might be overly conservative/xenophobic. For instance, I’ve seen videos on youtube.com of one of the monsignors who founded ICRSS–they are obviously very devoted priests, but their manner is slightly alienating to US parishioners. Thankfully, the EFM is in Latin.
In terms of financial aid, I don’t believe this will be an obstacle to your acceptance. There are links everywhere on all of their pages to support seminarians/donate this/donate that, and they even state explicitly that they will not turn anyone away. The 900$ per term figure is probably a general cost estimate that they present in order to demonstrate how expensive it is to train a priest… thereby encouraging donations.
You should probably call/write/and e-mail the US district office with your questions. I e-mail them roughly every week, and so far they haven’t gotten back to me. (therefore, write/call)