jbrams:
Congratulations on the weight loss. I've lost 50lbs in the past 1-1/2 years.
A note on the bar position relative to your posture: Be aware that the old Brit 3-speeds were very short in the cockpit compared to more recent bikes. Not only did they have very short stems, but they had short top tubes as well. That means that your present posture is not as upright as you may think - it just feels that way because of the sudden change. If you stretch out the setup, you may negate the advantages of a more ergo bar by actually putting the weight right back where you didn't want it. You'll likely find that the single hand position on NR's works against you.
My setup is an adjustable stem, but it is set at about 80mm, which puts the middle of the grips in a line crossing thru the quill. My spine is about the same angle as the seat stays - not bolt upright