Weestrom Regulator set up?

[Threewheelbonnie]

Does anyone know what type of voltage regulator is fitted to the Wee and how it will react to a reduced load?
I’m looking at my options for heated kit, probably grips, a seat pad and a vest. There is a slight chance (with a pillion wearing the vest) that all three would be used together, giving enough load to start draining the battery.
The best solution would be to replace the headlight and tail light bulbs with LED’s, thus giving spare capacity when needed. However, in the back of my mind I have it that there are two type of regulators used on bikes and that the cheaper sort (shunt type?) doesn’t actually cut off any excess production, it just leaks it away via one of it’s own components. If this is the case, the excess when the heated kit is not in use will be bigger than the system designers envisaged. Would normal use (Summer) without the expected load heat/wear the VR faster or cause it to overcharge the battery?
I’d rather fit a three position switch that locks out the seat heat when the vest socket is on than fry a VR or battery.
Thoughts appreciated
Cheers
Andy