I'm in France, maybe I should open a proxy. You order through me, I reexpedite to the US, with a French stamp lol.
A slightly greyer version: you open the box, add a ribbon to every item, repackage it, mark it "final assembly in France".
Unfortunately for you, your business probably gets outcompeted by the guy who has the same idea in Canada.
Country of origin is taxed and not country of shippment.
Also, I can tell you that the country of origin field has one of the lowest entry qualities of all fields. People just don't bother, and customs don't have the capacity. Also, depending on your warehousing, there is a good chance you simply don't know. If something in your item bucket came from either China, Vietnam, Malaysia or the Philippines, what are you gonna write?