I would like to test the viability of Proof of Presence to thwart secret chain attacks in a high transaction verification speed environment.

Could someone please show me where in the Peercoin code Proof of Presence should be added and where to drop the verification time to 1 second?  I am a complete noob to cryptocurrency code, but have been programming for decades, so I really just need a quick kickstart...I think.

For reference: "Proof of Presence" in the simplest form rejects consecutive blocks verified by the same miner's address used for rewards & fees.

Thank you to whoever so much in advance!