This is not exactly what you asked, but I have used a couple dozen things as scrapers over the years, and one of the least fatiguing was a utility knife blade with a small handle. We used them with the scouts, for instance.
I take a little 2"+ length of 1/2" dia. dowel or something, saw a slot lengthwise and epoxy in the blade. Then just rub the blade to one side forming a hook, like you would to turn a hook on a cabinet scraper, but only on one side.
You can only drag it one direction, but the bulge of the little handle is easier to hold without a death grip.