Good ideas to consider Dan.
Wonder if an epoxy putty would work to fill in the worn splines and then a bolt to hold it in place.

Another thought, Drill a cross hole thru the yoke and the input shaft and then ream it to take a taper dowel pin.
Then have a new spline welded in the drive shaft and balanced.

Now to take us back off topic.
After taking the pictures.
I was sliding back out from under the truck and stirred up a wasp nest under there somewhere.
Our German Shepard knocked down three of them so I could stomp on them. Neither one of us got stung.
His nickname is Deer Slayer.
Here is a picture of him chasing a eight pointer across our pond and then a couple of boys dragging it back to the house, two days later.

Don
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1967 GMC 9500 Fire Ladder Truck
"The Flag Pole"
In the Stovebolt Gallery
1946 2-Ton grain truck
1946 3/4-ton pickup,
1953 1-ton pickup
1957 1-ton flatbed dually,
1954 Pontiac Straight Eight
Of all the things I've lost in my life, I miss my mind the most!