For what it's worth, I just read the AVL Repair Manuals description of how to change/install the push rods.
It says one removes the rocker arms by pulling the 2 pins they rotate on, then remove the rockers (being careful not to have the thrust washers fall down inside the engine) and then pull the push rods out.
Maybe doing it this way would make installing the shrouded push rods easier than the method 2CV used?
Just a thought.
That's the way I did it when I had the head here. It is a bit of a pain in the ass to fiddle with the thrust washers. But it works.
He had to take the head off again anyway because I was having him do a valve-to-piston clearance check anyway, wit clay on the piston crown and rotating past TDC on overlap.
Turns out that was a smart move, because this big valve arrangement just barely has enough valve clearance now. But it does make it safely with enough safety margin room so it won't hit.
This was a big chore for him to do, but I insisted on it to protect the new valves from potential damage if it didn't clear.
In the end, it turned out that all was well, but it was close.