I would go the other way, and limit the participants in the election
for the community seat to people who are members of the volunteer
community. Presumably that would include most members of most
organizational boards, but only include those staff and other paid
workers who also participate as volunteers.
Most chapter members and representatives participate not only in the
community elections but also in the selection of chapter-nominated
board seats. It doesn't seem like chapters as a group are at all
disenfranchised.