Derail!
Three things will be a problem for you for long rides: tank range, footpeg height, and luggage options. (Naturally, all this only applies to the gen I own. The new standard one is definitely more focused on distance work, at least by appearance, but no idea how it works in practice. Shame that new screen is a bit ugly and ruins the lines of the bike...)
The tank range is what it is. You *might* be able to improve it somewhat by modifying the fuelling, but only by increments or you risk running lean. 200 km is about the best you can hope for if you're judicious about throttle use and short shift like crazy. 170-180 to fuel light is typical for me, much less if you let it rev. This is fine for staying around populated areas, but could be problematic in sparser areas like Northern Ontario.
Footpegs are all a matter of preference. I'm a sportbike refugee and did light touring for a number of years on a ZX-10R (6-700 km days for three to four days at a stretch), so the frog squat is what I'm used to. The Tuono doesn't bother me at all. You can get
lowering pegs that'll give you another inch or so, but not sure what that does to ground clearance.
Third, there's not a lot of hard luggage options.
Hepco & Becker do a few things that are quite ugly with the bags off, but nothing elegant. If I follow through with my plans to make a sport-tourer out of mine, I'll probably go with a modded version of the
SW Motech Blaze system, as it's much more easily removed for day-to-day and I prefer packing light. The tank is plastic, too, so tank bags are fiddly and the factory bra apparently doesn't actually fit newer models, at least according to AF1.
I feel your struggle. Looking for that perfect 'do-it-all-and-look-good-too' bike isn't easy. Bringing it back on topic, what about popping a flyscreen on the SDR? It sounds like an ideal bike for you otherwise, so if all you need to do is smooth the airflow a bit, maybe a wee screen would do enough? None improve the looks, granted, but it'd be a cheaper solution than eating taxes and depreciation on a trade...