Spoke to Raj at Beisan and the procedure is the same for my type of Vanos, it just has a metal housing instead of a plastic one.
So with the knowledge that I wouldn't screw up some hidden plastic housing, I was able to dig out the Teflon and O-Ring without any trouble.
Inserting the new O-Ring went without a hitch
And sliding in the Teflon ring was also straightforward
There is a little curviness with the ring fully installed, but that should not impact the function of the ring, and should straighten itself out once it gets hot.
Raj did say that with the metal housing vs. the plastic one, I won't be able to time the Vanos using a multimeter. I guess I'll figure out how to deal with that when the time comes.
Craig got my parts list and is working on pricing for me. With a bit of luck, I'll start putting the engine back together by the weekend!