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It was 14 years ago when I made my IR setup, but as I think about the problem now I wonder if perhaps a high framerate stereo camera and OpenCV https://opencv.org/ , worn on the hand in a glove (or on the head with a cap), with cameras aimed at a QR code pattern, and attached to a belt-worn Raspberry Pi 4 and power pack, could yield anything of interest. Seems like this would force the wearer into possibly both intention and postural tremor. This wouldn't even touch the problems you mention of separating intentional movements from tremor movements though. Food for thought I suppose.
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