Fred,
You know your clutch disc is good because you were driving it, so personally, I'd spend more time trying to free it.
I've had a clutch stick on a 404 (it sat unused for 7 or 8 years before I bought it in Germany). I tried the immovable object technique and peeled the friction material off the disc and had to do a complete replacement.
When you were driving around, you had the petal down, right? That's a must to allow the disc to wiggle on the input shaft splines to come free.
That will be tough on the throwout bearing so it'd be a good idea to grease it first. There are instructions here:
Rocky Mountain Moggers - Greasing a Throw Out Bearing
Then drive the mog some more, as you have been doing, with clutch to the floor.
You might also try shortening the clutch linkage to put more pressure on the pressure plate fingers. There's risk to do that because those fingers, and the pivot points they rest on, can break (I had to weld one back together through that access hole!).
If that fails, it might be possible to back off the pressure plate bolts, through the access hole, to relieve pressure on the clutch disc. This for sure won't be easy, but compared to moving the engine to replace the clutch, it'll seem worth the effort.
[edit: if you do have to replace the clutch, that can be done by moving the engine forward. I've done that a couple of times and would be glad to give some pointers.]
Bob
I have had this gut feeling all along but didnt want to admit it to myself. I am hoping for a miracle at this point.