If he removed all of the stuff he mentioned, he might find fan shaft bearings, seals and O-rings that also need replacing. Something to think about.
One thing that I noticed when I fooled with those fan clutches - trying to compress the circular keeper in the end of the shaft is interesting. You would think that with a bearing splitter clamped in or behind the fan pulley, you would be able to rig a contraption to compress the spring and remove the keeper. In the few tries that I've made, the keeper stays put on the shaft and the pulley moves. The service manual shows them doing it in a press, but it would have to be taller than mine. So - I tried my drill press and it worked as a long press. I've also rigged a contraption with all thread to hold the bevel gear end of the shaft from moving (before I thought of the drill press). Doing it on the tractor, I'd try to anchor on the housing behind the pulley, or press from the pedestal - assuming you can get the radiator out of the way. It's not a hard press, but seems to need three hands to get everything positioned.
I'm not a mechanic, so take my comment for what it's worth.