'Texas ebony' is probably the other Diospyros, D. texana; common persimmon is D.virginiana. Both are true ebonies. I've never worked with the Texas type, but D. virginiana is a lot like Macassar ebony in mechanical properties, although it is seldom black. It makes good bridges and fingerboards
I don't see why you couldn't use walnut for a fingerboard on a Weissenborn; I've made dozens of mountain dulcimers with it. It's too soft for guitars, of course, but, as you say, if you're not actualy pressing the strings down with your fingers it's fine. Just don't get too vehement when you're putting in the frets: I had one young student hammer them right in out of sight.
Walnut makes a good bridge, too. The trick is to take into account the fact that it's lighter, and not as hard as most other bridge woods. Make the bridge outline larger to get some weight back without stiffening it too much, and set the saddle slot farther back from the front edge. It also helps to use skew cut wood, which is less prone to splitting.
I've used maple for fingerboards in the past, genrally staining it with a 'tea' made from black walnut hulls. It can come up almost as dark as walnut, but the stain is transparent enough so that the grain shows through if you use something like birdseye or curly maple. I'm using the same thing now on a hop hornbeam fingerboard for a guitar I'm putting together for the Montreal show.
I suppose some fine-grained Osage orange (Maclura pomifera) would make a good fingerboard, and bridge as well. It's about as close in properties as you'll come to Brazilian rosewood, but the color might be a problem. Some folks claim to have had good results staining it with tannin followed by ferric acetate, which is a tradiational black stain. I seem not to have the best tannin around.
Finding a good fingerboard wood is going to be the hardest challenge in the 'local wood' seach, I think. It's difficult to think of a North american wood that is both dark, so it won't show the dirt, fine grained, and hard. We've all been spoiled by ebony.
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