A thought occurs to me: maybe the mod has more to do with the starter circuit than the lighting.
The V11 is prone to what is often referred to as "startus interruptus", i.e. when one presses the starter button, one is rewarded only with a click from the solenoid on the starter motor. The cause is insufficient power to the solenoid to pull it in properly.
This is a problem that not only the V11 models suffer from. The common solution is to feed the starter solenoid directly from the battery, i.e. the power feed to the starter relay and from there to the starter solenoid, which is switched by the starter switch, directly from the battery.
That is how I solved the problem on my Breva 750 i.e., but it is not that simple on a V11.
The starter relay is of the type that has both a normally closed and a normally open contact. In the "resting" position, the normally closed contact feeds power from the ignition switch to the lighting relay, thus holding the lighting relay closed, i.e. "switched on", thereby feeding power through from the battery to the headlight.
In the "switched on" position, the normally open contact of the starter relay is now closed, thereby taking the power away from the lighting relay (good plan, the lights go off when the starter is engaged) and feeding it instead to the starter motor.
This means, if one were to feed the power to the starter relay directly from the battery, the lights would be one all the time because the starter relay feeds the power to the lighting relay in its "resting" position.
Therefore, in order to supply the starter solenoid with power directly from the battery, it is necessary to add another relay for this purpose. There are some threads here on the subject, which one might be able to find by searching "sixth relay" or something like that.
So, to cut to the chase, maybe someone has done that modification and mounted the additional relay up near the headlight.
I would have tried to integrate it into the row of original relays, not hard with the right parts, but not everyone is as much of a perfectionist as me.