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This is the brace I used once my thumb got to the point that I couldn't move it or let anything touch it without blinding pain. I still can't do any handstand work but for everything I'm fine as long as I can use bars to keep my wrist in a neutral position
edited bc I forgot the damned link: [link]
I got mine from a orthopedic doctor, but essentially it's like this. It's not flexible for your thumb, but all your other fingers are free.