You might have to improvise another type of handle for this. Possibly a crank handle from an ice cream maker, another might be a handle for a universal table grinder. Measure the shaft size and hit some flea markets or garage sales and maybe something will show up. A lot of old style kitchen "machines" were crank run prior to electric motors running the show. Just thought of another, a closed end wrench to fit and you could always fit a handle to the wrench to turn it might work. Hope this helps.
Jon