Hey Gonzo,
Since the progress is tied to the account, I'm pretty sure that your progress would be maintained if you bought a US copy + US expansion pass.
I'm not 100% sure on this, so if someone knows for absolute certain then please let me know.
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Just did it and it worked :) thanks man
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Excellent! Glad to hear it worked out :)
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Thanks for replying! It should work, wanted to make sure i wasn't missing something that others might see.