Surly just released a new handlebar and it reminded me of this thread. It's not suitable for your bike because it has a modern 31.8mm clamp diameter, but it's similar enough to a lot of others available, with a 34 degree sweep and 40mm rise. Bars like this have the effect of relaxing your wrists, but they don't really sit you up very much, only a little from where you started. They will still be about level with the seat.

Surly has another handlebar, the Sunrise, which will sit you up, but not sure if its style will suit you.