Since you seem to think that there must be some kind of bike brand which is best for flat bars and touring, I would have to suggest that you immediately abandon the idea of cycling even moderate distances, let alone long ones. Start riding around your neighbourhood for a few years first until you develop some basic knowledge about cycling, at least until you can properly ask a question that makes sense.

That might seem a little harsh as a reply, but that's what you get when you ask a question by first imposing pre-conditions to the answer. You obviously already know what you want to hear. All I can say is that if you expect to ride or tour long distances like that, you may want to sign up on a carpal tunnel syndrome forum or a forum for some other wrist problem. Despite the other masochists you might hear from here, the mountain bike bars are Ok for mountain biking, but the wrist position is so unnatural that it's asking for trouble if you intend to ride long with them.

You can listen to and join the other refuseniks and other assorted contrarians, or you can listen to reason and experience (not mine, but the experience gained over a century of cycling).