Do ye be handy with tools such as a welder and a blow torch?
If so, you can make it yerself...
Use half inch square stock, steel bar, heat a piece with the torch until it's the color of straw and you will be able to bend it into your hook.
Prepare the second piece to weld the hook onto, clean up the welds, heat the entire piece until it's the color of straw, then let it cool, or if you want to temper it (I wouldn't ) dowse it in a bucket of water or oil...
Now you can stick the end into a wood shaft and pin it, or you can make a socket (best )....
This description of the process is very basic, I've made a bunch of stuff in this fashion....
By the by.... when did boat hooks appear?