and wait for "rotate". No need for concerns as to whether or not that inbuilt 2 seconds exists and/or is applicable to my airframe type
Be careful there. The word from the PNF of "Rotate" is purely a back up and not a order, although depending on how loud it is called it is often taken as an order rather than simply a speed on the PNF's ASI.
You should commence rotation at VR on your own ASI - not on a call from the PNF. In the simulator we often see delayed rotation by the PF because he unconsciously waits then acts on the "Rotate" call from the other side of the cockpit. Often see 5-15 knots delay in rotating especially in the engine failure case simply because the PNF forgot to call and the PF waited and waited and waited.