Changing tuners on a Warren May dulcimer.
Instruments- discuss specific features, luthiers, instrument problems & questions
In all all honesty, I would not change out the tuners. You will be seriously impacting the re-sale value of the dulcimer.
The best thing to do is learn to live with and use the original tuners. It really isn't hard. You can get fine tuners that will allow you to dial in a tuning once you're close with the pegs.
There really is no sure-fire solution. There are Pegheds and Knilling/Perfection geared tuners which look like wooden pegs, but there is a better than 50% chance they will not fit the existing holes in your dulcimer. If you enlarge the holes you'll never be able to use the original tuners again.
If you absolutely can't stand the dulcimer because of its wooden tuning pegs, IMHO you should seriously consider selling the instrument before your consider changing out the pegs to something else.

But seriously, this is a neat idea. I wish I had saved all the little percussion "toys" from when my boys were little...