I have a lowly CMC And as such it doesn’t have that spiffy access panel on the bottom of the tunnel as Lane had.
When my clutch tube let go at the welds, the clutch acted just like yours, Meade. I got out the angle grinder with a cut-off wheel and, zip-zap! I cut a door in the passenger side of the tunnel for access so I could re-weld the front of the tube to the anchor bracket. Adding a 3/4” wide strip around the edges of the plate removed turns it into a panel that can be re-attached with screws for future access. Unlike Lane, though, I don’t have to get the car up in the air to gain access - Just flip up the carpet and unscrew the panel.