So what are your goals for the 3 weeks? If you are giving yourself an ultimatum you might consider setting a benchmark even if it is something you don't share publicly.
I have gotten a bit too accustomed to not making my goals with mine and while I don't like it I do believe I named my project accordingly... although "Setback" has a nice ring to it too.
As I read what you wrote about the age of the yoke I remembered the story. While it would mean more out of pocket for you do you have any "Clutch and U-Joint", "Proven Force" or other drivetrain/differential specialists in your area?
Alot of us love our cars so much it is tough to enlist help like that sometimes preferring to use race shops and such. That said, machined tolerances and setup are not that different from high horsepower race/touring than they are from heavy duty/ over the road abuse plus some of those guys share our passions outside of work.
Just thinking outside the box, but what you seem to be struggling with is all in a days work for some shops and it would be one mountain reduced to a molehill and out of your path.
Please keep us up to date on the Dynatech saga too.
I wish you the best over the next few weeks.