I was gonna say... I've been slightly interested to clip n' flip my B123's. If you cut them low enough on the drop, they should have a really pleasing curve with a good hand position or two when flipped.

Anyone have pictures of how this turns out? Specifically, with Nitto or other track bars?

As for a cheap 90mm stem, if you have access to Peformance or Supergo, the Weyless line of MTB stems look like a good deal for the money. $10-16 on sale.