A bargaining unit of higher education employees under RCW 41.56.021 shall not include any employees eligible for collective bargaining rights under RCW 41.56.022, 41.56.024, or 41.56.203, chapter 28B.52, 41.76, or 41.80 RCW. Employees whose eligibility for collective bargaining is covered by chapter 28B.52, 41.76, or 41.80 RCW are exempt from the provisions of RCW 41.56.021.