While this would give them input to the board, it also keeps them active.
You say he has made complaints to the state. Why not ask him to put his concerns in writing with what he would like to see as a correction and send it directly to the board? In other words, you are trying to give him input to the board and not avoid his concerns.
The board has a right to establish meeting policies that allow certain time periods when members can address the board. Establishing these policies would still allow him to talk but would limit him on the subject as found on the agendas. The board can also invite him to meetings where one or two of the directors are present, not the whole board. Let them talk and ask him what his solutions are to his problems.
Being a director does not limit their member’s rights. A director has every right as a member to solicit proxies and petitions. You do not give up rights or obligations when you were elected as a director. Boards have both directors and officers but only the directors vote. As an officer they have a first responsibility as a director and therefore they vote as a director not an officer. Just because your documents say you have one vote it does not limit nor restrict directors or officers from voting as members at annual meetings; they still have a vote as directors at board meetings.
As for two persons from the same home serving on the board, condominiums are restricted to only one member at a time but HOA statutes do not have this restriction. You are addressing three boards and you can have multiple owners serving on each of the three boards since they are separate entities. Think of each of these bodies as separate operations.
The final decision is with your board of directors. Its members have the responsibility to take information from professionals to make their decisions.
In my many years of answering questions I’ve found that people often keep asking the same question until they receive the answer they want. Your association apparently has a problem in which some owners want to park their boats on the property and they continue to ask the same question hoping to get a different answer.
I would recommend that you follow the advice to have the change to your documents voted on all the members. This way you can put the question to bed.