Security Light Tinkering

I want a security light for the end of the house, but not one of the 500w floodlights - just a simple carriage light. However, I have two additional requirements which have proved impossible to satisfy :

1. The PIR needs to be part of the light, and able to trigger from a sideways approach, not front on.
2. It needs to have an override switch capability so it can be switched on permanently.

I have finally managed to find a light that satisfies the first of these requirements, but not, officially, the second. The light I have purchased is completely self contained. It has a 3 wire connector (live, neutral and earth) with the PIR and lamp circuitry all on-board. You just wire it up to a lighting circuit, optionally switched, and it just works. The PIR sensor rotates about the body of the light to give the necessary sideways detection.

Fortunately the innards dismantle giving access to the circuit board. A wire fed through the casting alongside the other three should give the ability to switch the light on in parallel with the PIR. Here it is after the extra wire has been pulled through :

A 3 core + earth cable is in place to power this so it should now just be a case of fitting it, and the electrician wiring it all up. Time will tell if it is going to work.