Preferred geometry for upright seating position?
I'm thinking of putting together a road bike with an upright position that is easier on the neck, back, and groin. (something along the lines of VO Portuer or Nitto Promenade handlebars). I've seen setups like this on a Surly Steamroller, which has fairly aggressive road geometry. My intuition is that most road frames, intended for a more aero position will not be ideal, but I'm not sure, so I'm asking. Is a different geometry ideal, or should I just build on a road frame?
It seems that upright position will transfer weight to the rear wheel, so a longer chainstay/wheelbase will be ideal to balance things out. Therefore I've been looking at some touring frames. But these are overkill for the kind of riding I'm doing (short commutes withouth much to carry).
(Note: I'm also wanting CroMo, horiz top tube, and horiz dropouts)