Have been looking at these too. UK regulations (MOT) state the DRL's must go off when the Main (dipped) headlights are switched on. Which means DRL's do not function at night time (when using headlights). Also to note when a car puts it indicator on, the DRL on that side will often dim, to ensure the indicator is visible while flashing.
If there is a sufficient distance between the DRL light and the Indicator, I don't see that as necessary - considering with alot of Cars, the DRL is often incorporated into the same Light unit as the headlights.
With a MOTORCYCLE, you'd ideally want ALL lights on at the same time, and not some clever switching process with the headlights (making you much more visible to other road users). I think it might be best to incorporate the DRL's into the low beam circuit (as you have been doing - so they come on as the Light switch for low beam is operated) however also with an inline Switch on the handlebars, so the DRL's can be turned off selectively - MOT, etc ??
With DRL's there's a fine balance between function and looking like a cheap Christmas tree. It's good that there's plenty of 'bolt on' options on the market now to choose from.