The BuyFromEU subreddit has grown quickly!
Purism is not needed; only persistence. if every EU citizen swapped *one* US brand for a European brand, that would be felt. Any change, multiplied by large numbers, is to be felt.
Talk to your family and friends about this doable goal.
Bonus: Once a person justifies switching one product, s/he is more likely to switch a second, so the effect is self-reinforcing.