In a few countries.... I think it's Peru where they actually in the legislation enumerate by disability or types of impairment. They have broad categories, but they do that.
Another thing you might want to consider specifying in the bill is that the vice-chair or the chair be designated, or that they rotate. The Americans do that. Some other countries do that. So you name in positions. You build in not just a floor number, like a minimum of 50% plus one, but you identify certain key roles.