Are other countries accepting Basic Med for flights through their airspace, for example the European Union?
(I've made this a community wiki answer so that others can add new information if/when things change.)
These countries allow US pilots to fly with BasicMed:
It wouldn't matter, as BasicMed is only valid for flights within the United States.
Q23: Can I fly outside the United States under BasicMed?
A: No. You cannot fly outside the United States when operating under BasicMed.