This is actually a lot more easy than you think. If you are to keep the existing Static IP Address for your Deployment Console, after upgrading they will automatically report to the DS.
When upgrading, there is no need to establish a new SQL DB. Keep your existing DB and there will be no need to import export anything.
If you are establishing a new Static IP for your DS SP5, then before bringing down your SP4, select all clients, right click, click on "Change Agent Settings" > "Production Agent" > change the "Address/Hostname" to the new Static IP your SP5 will have and they will automatically report to that IP.
Let me know if you need anything else!