Well as the CAA told me today, if you get FAA class 1 medical, and FAA commerical license, then there might be a way.
I will anyway make a formal letter to them to get this information in writing.
For me the requirement of pre op conditions seems to completly nonsense, specially when they will possibly give a class 1 license after flying commerical in other countries.
I dont know your details oll, but I would say dont give up, where there is a will there is a way. Also going to US might end up cheaper in the end even after converting licenses, simply because the hour building is much cheaper there.