The common standard exists already! It is international business English and my point is that German or Indian speakers are often much better at it than many Americans I have met. Weirdly enough, Americans who happen to also speak Chinese or another language are much easier to understand in English. Probably having learnt another tongue teaches you how hard it is and how annoying are those natives who make no effort to slow down and clarify their speaking, and no effort to understand others as soon as they pronounce slightly differently from hometown accent.
