Would putting drop bars on my vintage mountain bike be worth doing? The stem quill is of a smaller diameter than a normal one, as is the handlebar clamp size on the current stem.

Unfortunately I can't afford a decent winter specific road bike, and I have studded 26" snow tires, so I am planning on using this bike through the winter. The handlebars just really, really bother me and I want to change them to anything else, but more than anything I'd love to use the set of touring bars I have sitting around.

Any suggestions on a stem that will make this possible?

Pic of the monstrosity