Tried everything else. Looks like I'll be drilling the assembly out. I think I'll start with the tumbler. I don't see why I can't take a small drill to just before the #1 position and drill through the tumbler face, allowing me to insert the pin to free the detent, so I can pull the tumbler. After that I may still need to drill the locking pin out of the collar. I have a parts car that I'll pull the replacement pieces first to get a good look at all the parts.

I'll probably start this weekend. I'll let you know how it comes out.