Another update.
The “Whack a mole” valve removal tool worked very well for removing the valves.
Not for reinstalling them. I made this in about an hour on a Sunday afternoon. Didn’t cost anything and works well.

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2001 x5 3.0 (sold with broken motor), 1990 e30 M3, 1991 318is, 2002 325i, 2008 335i Dinan stage 3 6 speed,