Since some people are using this layout, we should consider shipping it. There has already been a request/patch submitted for this, see:
Created attachment 531 [details]
US International Layout
Lots of missing characters in that one. And it didn't tell Windows to switch to the international layout. Attached a more complete mapping.
I have verified the attached layout is complete.
Added upstream in commit 1815.
Vendordrop in commit 29115.