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I'm not against the idea, but I was able to break away a lump of the interior timber with thumb pressure, it just won't be possible to work it. The narrow section without fissures should make a couple of thumbsticks. I'm with you on the choice of timber visually, but would need to check the strength (hornbeam would be fine), besides, I haven't got any! What I have just been given is some Macassar Ebony just wide enough to make thumbsticks.
Here's the first, it just needs fitting to a stick and finishing. That's at least 9 months away as I have no seasoned left and the contrast between light Holly and black Oak is the only way to go.
The grain is incredible and shows how harsh the growing conditions must have been, this piece is 12.4 cm and took over 150 years to grow.