A thin knife with a thick spine might be hard [read: nearly physically impossible] to find. How about a leather glove to protect your thumb? If you're worried about impeding your dexterity with a whole glove, then why not cut the thumb off of a leather glove and secure it with a cord around your wrist (sort of like a leather thumb-condom that you tie in place)? I don't know if you're familiar with archery equipment, but finger guards are a necessary accoutrement. Some are simply leather flaps that you place over your fingertips to protect them from the string, while others are like what I've described -- 3 finger condoms that are held in place by a strap going over the back of the hand.
On this site you can see what I'm talking about. Some are just simple leather tabs, while others are more complicated finger-covers ("Basic Leather Tab" vs. "Gompy Leather Glove" or "Neet Leather shooting glove").
This way, you can keep using your favorite knives.
Contact Anza Knives and tell him your needs. The knives are made from files and have thick spines and I'm sure he can grind one with a thin edge for carving. Not expensive.
Although Sebenzas are rather expensive, they have a deep hollow grind and a relatively thick spine, and the spine is rounded.
Another possiblity is what I do with my knives anyway: take a ceramic rod and buff the back of the blade. This will not show up visually, but you can feel the difference once the "wire edge" is removed from the square cut blade spine. This may relief enough of the stress to save your thumb from friction.
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