TwinGS, that's a contender, if not the ultimate DS bike IMHO. I've both a DR650 & HP2E & often wonder which I'd go RTW on, (probably the DR650 though). You've set yours up perfectly with the HPN tank & bags.
The HP2E is great b/c of the threaded valve adjusters, shaft drive, tubeless tires, air/oil cooling, 386 dry weight, 600w alternator, etc, plus it's all day comfortable. A BVMarkus underseat tank would give it all the range needed. I fabbed a Vstrom screen on my HP2 & can sit behind the thing all day now, & I just need some heated grips. I'd likely beg Al Jesse to make me some quick-click Odyessy bags & call it good.