I think Anker could sell in all countries this UK-only one which has just added the US pin 3rd slide-on option.
So sold with a set of 3 plugs.
Then it will cover the common move between EU, UK, USA. UK covers Ireland and a few other places. EU covers a lot and US covers US, Mexico, Canada and others.
Currently as the US pins are very compact, a UK adapter on a US plug is not that much larger than a UK plug but not in a wall charger as they just fall out in the wall charger format.
I might make up some photos of the realities and make a new thread.....