That's my solution in some places too. I generally want US spellings of words (especially in anything related to programming!) so "en_US language, Norwegian units/time/etc, but US number format" is my preferred set-up, but "UK everything" is an alright approximation of that for software which doesn't have that much specificity.
Try Canadian English: en_CA. That might be an even closer approximation of what you want. (They still spell some words the British way, but a lot the American way).
