Mike, that is not the keyhead your picture is showing, that is the changer system, keyhead is at the other end of the guitar, are you wanting to change the finger changer?
George Boards is making composite keyheads, maybe he could make one for you, a Sho-Bud style keyhead could work, keep an eye out for one on ebay, you want one with rollers in it.
Easiest key head design I've ever seen was on the original MSA PSG's.
I think that these from HR maple could also be option which could be done in a home-shop.
Was it JFK who said: Ask Not What TAB Can Do For You - Rather Ask Yourself "What Would B.B. King Do?"
A Little Mental Health Warning:
Tablature KILLS SKILLS.
The uses of Tablature is addictive and has been linked to reduced musical fertility.
Those who produce Tablature did never use it.
A key head like MSA used on the Classic series, This guitar has the Nut Roller free standing with 2 bolt up from the bottom of the guitar. Not attached to the neck like the MSA Classic.
In setting the angel of the tuner bars make sure the keys align with rollers, So the string goes straight over the roller to the key on the key head.