I like the idea of the blanking plate with bearing holding a shaft picking up power from the center of the dual cam drive. What is in the center? Can the dual cam wheel be removed without everything falling apart behind it? I think the dual cam wheel has to be removed to allow a flat plate to mount and use the original gasket and bolts.
VW has a engine driven rotary vane vacuum pump that could be mounted to the blanking plate. Some machining would be required. On second thought a bearing would not be required as the VW pump has a bearing at it's base. I think. There has to be a way to solve this problem, after all we have, on this board, a collection of the best automotive minds in the world.
I have my hat of to mack4 for the work he has done on this problem.
I purchased a Volvo Vacuum pump and a switch only to see the BUSTED sign.
Hart broken but not out of the game.

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1984 300SD turbo 126
"My true love"

God made me an atheist and who am I to question His wisdom