Routing specific individual inbox emails to shared when someone is out of office?

Hey All,

Sometimes a client mistakenly sends an email to an employees personal inbox, which is fine until they need a response and the employee is OOO. How would you go about setting up a personal/workspace rule to ensure this gets routed and handled in a timely manner? I have considered:
 

• Time based rule - if X hours has passed then move/assign to different inbox
• Automatically route the emails from that domain back into the shared inbox 

However, has anyone set up a rule where if an individual is OOO or busy the rule can re-route the email to the shared inbox?

TIA!