[Closed] 3 way switch for dynamo lights & e-werk?

So I am in the process of converting across to dynamo lights and would like to have the system wired up so I can easily switch from powering front and rear light to powering the e-werk and cache battery. Now I appreciate it is perfectly possible to run power to all 3 simultaneously, but I suspect that in practice the speed required to get the lights working and the e-werk charging a phone or your Garmin might be just too high to warrant having that option?

The switch I have spotted so far is this one, which would enable lights OR e-werk.

Has anyone used one of these switches?