Welcome @ADL I realize that I’m not answering your core question… I don’t really know the answer to your question. However, I’m just hear to say that if you really want a Fairphone in North America, you can make it work. There are plenty of us using the Fairphone 4 in the United States. (I can’t speak to Canada or Mexico.) A few caveats for the USA:
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You basically need to use T-Mobile as your cellular provider. (When I bought my FP4, I switched from Verizon to T-Mobile.)
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The stock Fairphone OS doesn’t seem to work for voice calling in the United States, for some unknown reason. However, LineageOS works great. That also wasn’t a problem for me – replacing the stock OS with Lineage or Lineage for Microg is essentially a requirement for my phones.

If you can handle those things (acknowledging that point 2 requires some technical ability), then consider moving forward. I imported my FP4 from www.clove.co.uk about a month ago. I’m very happy with the way everything has turned out.