49NORTH - I would phone trackofthewolf and ask if they can send brass to you.
There is no problem this side, just from the State's side.

We order all sorts of stuff from track, including CF rifle barrels, etc and get away with it due to them being a muzzleloading supplies outfit. I would try them.

If they can ship the brass, you are home-free. You will have to pay sales tax on the amount of the invoice, along with standard $5.00 custom's tax. Might be $10.00 now.

https://www.trackofthewolf.com/Categories/PartDetail.aspx/139/11/SHOT-SHELL-10-2-78