I'll jump in here, and agree there isn't such a thing, because there isn't a standardised human, so there have to be variables, hence you not getting what you want.
I used to own three motorcycles shops and build one off custom bikes from the ground up fo 20 years and if i wasn't into being a homeless bum nowadays I would most likely be the guy you would be coming to see.
I could build 'that bike' for you, but it'd be at a price. You would simply tell me what you wanted and it would happen, but there are companies out there that do this already and as mentioned you are looking at a full on race bike but tuned for more day to day riding.
So why aren't I riding 'that bike', one simple reason, parts...one off bikes that are perfect for you/ me are not perfect for extended travel, you would have a parts list that incorporated potentially parts from a dozen or more companies and one off parts too.
Sorry to be in agreement with the naysaysers, but its just how it is, Ive looked/ tried/ ridden more than my fair share - XT660Z, WR250R, XR650R, DR650, SXC625, a combination of the five would be nice