This is the easiest solution and certainly one I thought of, but here's where I get soft. The current stem is 30-35 years old and was my dad's. It sat unused for at least 25 years in his parts bin before I found a use for it. It's my favorite part on the bike and I'm really hoping to keep it. I'd have to go pretty long to get the hand position I'm looking for... at least to a 130-140mm.