I used to courier an NTV 650 so I spent long hours in the saddle. I have just measured my inside leg (with the dog's lead and a tape measure: only the best technique for me!!), and I think I'm about 34" inside leg, but then I'm 5'10", so maybe I've measured it wrong.......
Either way, I was comfy on the bike, with knees slightly bent and feet flat on the ground at the lights. Basically you may be a little tall on the bike... but trying one is the best way to find out. However, the NTV has not been manufacturered for quite a few years now meaning that however realiable the bike is, you'd still be restricted to old-ish bikes, plus they are often couriered.
Have you considered the replacement: the Deauville, if you like the NTV powerplant? Its faired, but the intergral panniers are pants, so if you are planning to tour, a decent top-box and a couple of roll-bags is your best way forward.
Adventure: it's an experience, not a style!
(so ride what you like, but ride it somewhere new!)