It’s imperative to check with the seller the version offered. The older version (Version 1) has two setscrews diametrically-opposite that bear against flats on the end of the elevation cross shaft. The holes for the setscrews are diametrically-opposite in a single tapped hole crosswise through the hub of the crank.
At some point the 23CII was revised with a tapered end on the shaft and a mating tapered socket, with angled anti-rotation flats on both. The crank is fixed to the end of the shaft via a long machine screw screwed into the end of the shaft and whose head bears against the crank handle. I refer to this as Version 2.
If you’re patient, eventually the Version 2 crank handle will show up on eBay, unless an APUGer with an extra offers one sooner.
If the one pictured in post #10 has no tapped cross hole in the hub, then it is the required Version 2 (photo is too dark in the hub area to be sure).