Need help! Using FBA US for my shopify and have orders in Canada

Hi, i think i might have messed up. I’ve recently started to move a good chunk of my SKUs to FBA US thinking I could do remote fulfillment and MCF on orders in Canada i get on my shopify website. I learned that MCF does not support international orders. I don’t get it because Canadian customers are able to buy my products on Amazon Canada or US with a canadian address but I can’t ship manually with MCF to fulfil on of my orders in canada. Anyone has been dealing with a similar situation or knows a workaround? This is a big issue for us giving we do get a decent amount of sales from Canada.

Thanks in advance!