Can you specify what in practice could be an issue with a "forced" password? Are some characters harder to input than others or is it a different problem?
For the non-American aspect, it's extremely common for websites to force ASCII today (either explicitly, or because using anything else breaks in various unexpected ways) anyway, I doubt that any internet user around the globe will have an issue with that. That boat has sailed in the 90s.
in my locale's keyboard, curly brackets and the dollar sign are not obvious to input. they require an additional combo of keys that most people have no idea about.