Have two classes set up. One with one man army and final stand and the other with last stand.

Use the first class and get a 4 death streak, then get someone to shoot you onto final stand.

Once that has happened, whilst in final stand, change weapon to the one man army kit, change class to the 2nd class with last stand on and when you get up from final stand kill anyone.

Every kill you get counts to the last stand pro!