My idea of ropes are somewhat at odds with much of the popular "wisdom", but I'll disclose that early in the process and where I derive my idea of works from fluff. Tigers and Stroms also work but are different to deal with. An airhead GS is almost as much as buying an older 1100 GS.
Though, if it were me I'd go for the bang for the buck. The KLR is always the right choice when BFB is the criteria in this sense. I don't think you can go wrong unless you close your eyes and pick a turd right off. About the only way to kill a KLR is dirt or stupidity. And that's dirt on the inside. Dirt on the outside doesn't seem to matter one bit. They can do a heck of a lot more than most people think. They are heavier than a real dirtbike but a GS Adventure is about as far away from a real dirtbike as a you can get and still dress in knobbies. If I were picking a bike to learn to adventure travel on, a used fully farkled, KLR will run about $4k or so for lightly used and piled dump-truck high with extras. $2000 is about the bottom end of ready to ride. And those things can go more and easier than the big GS, the difference in the price is paid in comfort. But that is workable too. As a point of perspective, at $2000 that used KLR costs about as much as a full rebuild on a GS transmission. The intermediate shaft, sold as a whole only runs around $1,600 and change... Then you get to pay the man to do the work. Personally when it is my time for this part of the adventure I'll be boxing the trans up and shipping it off to a guy I know who knows how to do it right, so it will be better than new for the next 200,000 miles. With a KLR? Just go buy another one.
And the KLR can commute, is fine at highway speeds, yes it is underpowered compared to a big inch multi go too fast machine, but who cares? You're getting 50+ mpg for about what cable with HD and a DVR cost the multitude a year. Not too bad a deal.
As for dirt, I figure you got it covered. Riding across the dry lake at closer to the double ton than most on smooth tires you're miles ahead with the loose thing...
But, I do know some gear things and the whole zen-who-gives-a-damn style of touring is way too much fun to not pursue for at least a bit.
I'll be out of touch for a bit here this year, but maybe toward late summer I'll be able to pull off a few weekends here and there. Next fall should be great riding.