I know what you mean, Mike I do things like that. Just wanted to know what the real problem was. The adaptor looks nice.
How about this: The stands have a tube with a plate welded to the tube. Then 4 arms bolt to that plate.
Take off the arms, drill a plate to match the stand plate holes and drill the 216 pattern on that plate also.
It seems like with the Marshall plate, or any plate, there will be washers or spacers to deal with. Not sure.
