English to Russian Bus/Financial Human Resources

Подскажите, пожалуйста, как правильно назвать должности "representative Board member" и "interim Board member" в следующем контексте:
The emergency approach for sudden or unexpected absences of members of the Board safeguards the continuity of the organization after an unforeseen event, such as death or major illness of a Board member. In such an event the Supervisory Board shall immediately appoint either the representative Board member or a new interim Board member taking into account the rules for segregation of duties.

Заранее спасибо.