Retain Agent Unavailable Code after Saving a Disposition

Is it possible to set an agent to an unavailable code after they save their disposition? We currently have dispositions set to required in 'Post Contact' for our ACD Skills. Once the agent saves their disposition they are immediately put into an Available status. What we would like is to have a 30 second window where, after saving their disposition the agent is put into another unavailable code. Once 30 second have passed the agent would then be put into Available status, ready to take another call. We are aware they can pre-set their next state by selecting the state they want to be in while they are filling out their disposition but if we could make the process automatic it would be very helpful for us.