That longer adapter you posted is actually just a quill stem extender, it allows you to put another quill into the top to make a short one very long.

Anyway, I would go for a quill stem with an open face. But I need a considerable rise (not hard to find), with a very short extent (currently at 50mm and feeling good). It seems impossible to find a stem with this height and reach without it looking hideous. I do like the sunlite one you link, and would probably buy it, but its reach is 80mm while I'm comfortable at 50.

What should I do?