Not really.
I’m up and back at it. I’ve put the offside wheel back on and put it back on the ground. The steering isn’t attached to the hub and I’ve manually turned it lock to lock. No clunks.
Started the car and turned the steering lock to lock just with the nearside wheel connected to the steering and the clunk only happens just before and just after full lock in both left and right directions. The inner track rods still twitch per my first video clip.
There no movement in the outer track rod ball joint and the inner one seems stable too.
I suppose the answer is to disconnect the other ball joint and see what happens when there’s no load on the rack. Not sure what else it can be as far as an unskilled to reasonable home “mechanic” rolling about on the floor