Hi X2Farm,
I don't think you'll get a definitive answer on this one. Technically speaking I would think if well cooked, all would be fine.
There are possibly some dangers during the processing though. I know of someone who was diagnosed with MG, though I wasn't aware it was zoonotic (able to be transmitted to people). On the other hand people autopsy these birds routinely. They probably wear gloves and masks of course.
It would be your choice, but I feel that not eating sick birds is generally a good policy. Degree of sickness probably forms part of the judgement, as a good many 'well' birds from an MG flock would still harbour the bacteria (though at much lower counts).
Tricky one,
Erica