The shaft is one obstacle. The sleeve bearings are generally damaged as they're much softer than the shaft. Sometimes you can get away with reusing them but most of the time there's enough wear that it makes a racket during agitation when reassembled, even with a new shaft. A good machine shop should be able make and properly fit new sleeve bearings and maybe fix the shaft by welding and re-machining the wear/corrosion areas.
The groove pin is another obstacle. They're difficult to remove (post 1974's are much easier), re-install and are not reusable. The service manual calls for banging them out with a hammer and punch but I had better luck pressing them out which prevents damaging the shaft, sleeve bearings, and the possibility of staking the groove pin if it mushrooms during the removal/installation process. Finding a new groove pin will be a task, they were obsoleted in May of 2015 and parts dried up very quickly after that.
I have toyed around with making new shafts, sleeve bearings, groove pins, clutch washers, and the Delrin pinion gears before 2020 but I think costs would now far exceed what most would be willing to pay with the large increase of pricing the last 4 years. Damaged/seized upper shaft and upper sleeve bearing is the main reason these washers are trashed.