Here's an alternative you can try. How about a keel strip about 3 ft long that tapers from nothing to about 1 1/2 inches. About a half inch wide tapered to a blunt (V). You can hot melt glue it on for trials and carve it down to get something that feels good to you. Then you can do a permanant installation - epoxy etc. No rudder or skeg complications and It may solve your problems easily.
I really dislike no tracking. I've been paddling for years and I fixed a Greenland skin boat this way. When I first tried it, it was all over the place on a following sea. I spent more time correcting and ruddering than paddling. A simple keel addition changed it into a different animal.

Even brand new paddlers can paddle a kayak that takes care of them. I see it all the time in tour groups that have tracking hulls with no rudders.