Hi William!
I know it sounds harsh, but no matter what you choose to do you will encounter problems with the community. If you introduce worldwide shipping, people will complain that it is too expensive, but if you don't, people will complain because they can't buy one where they are from. If it is possible, choose the latter and introduce worldwide shipping as it gives backers choice.
I think a $35 shipping cost anywhere in the world is reasonable and I don't see anything wrong with it. The important thing is to make sure you are honest and open with your backers/customers when asked about the high shipping cost. If that is the best you can do then go for it
Cheers mate!
Jake
Team Backertree!