I sent a 64" 1pc. longbow to Norway. I used a well padded tube over all length had to be close to 70",I don't remember the dia.
I used USPS international express, Less than $80
with all the insurace and tracking.
The usps website does not allow this but I have done it twice from my small town P.O.
I sent a smaller,56x4x8, box to Aus. with the same service and had no problems.
I would go ask a human.
Another thought is DHL. I used to ship to forign countries alot in a prvious life,and DHL was the best for that. My packages would be of smaller size most often back then.
Chuck