[Short 3/4]

You might try a speedy sleeve. Not sure about the tool Torque King sells, but they really know their closed knuckle stuff, so maybe get more info (and please share with the group).
You really don’t want that inner seal leaking. The gear oil will find it’s way to the closed knuckle and dilute the grease in it. BTW, best grease for the knuckle is John Deere ‘Cornhead’ grease. Anything else gets too thin and just leaks out, leaving a mess on the outside and a dry ujoint on the inside.