I briefly considered the same thing when I was building my -6, but I quickly realized it was unnecessary weight and complexity just so I could avoid committing to one or the other. In the end I built a tailwheel -6 and wouldn't have it any other way.
If you're not a TW pilot and think you might want to be one day, get the endorsement now and build a -14, you won't regret it. DISCLAIMER: I might be biased about this