I saw another thread talking about PCGS. PCGS Paris have said if we get them to them, they would do the export / re-import to get them graded with their US counterparts. However, they say 3-4 months turnaround!
Personally, I'd do this Most coin grading companies let you put your put your own value on the forms for insurance reasons, but I'm not familiar with PCGS yet!

Yes, the turnaround sucks, but damn, those kinds of coins deserve a slab IMO, plus with PCGS you'll have more options with REAL auction places nowadays & in the future, like Stacks & bowers etc