There isn't one. English is not imposed by an authority, it is pulled and pushed from all directions by schools, corporations, governments, history, fashion, misunderstanding, other languages, bloody mindedness, and more.
The one used on national UK TV for example and as I said it would be a fork, you don't want to force people to change, though something like Esperanto would cause less outrage then forking english it seems.
OK, I give up on my idea, hopefully some linguists would popup in here and link some articles that would explore the topic. I think it would be interesting to plug some rules into an algorithm and have it search for the optimal language. We would not force it as a main language but a secondary one, like when you make a movie or book you provide a translation in this language too on top of the other popular languages you support. Since is a simple and perfectly defined language from it you could auto-generate translation to less popular languages.
