Suggestion: Keep the 6-string.
Replace the lowest string with the very high g string from a 12-string guitar.
Retune the high e-string to d.

If you can learn to clawhammer on this it will sound okay, and you'll have an extra bass note!

You will seem very cool, and can say you're the best in the world in the 6-string clawhammer style, due to being the only one.