I don't want to interfere with the discussion, but someone here asked about...
"Looking for a way to turn on the light when the ignition is activated."
Simple solution: Briefly remove the light switch (press the switch inwards).
Turn it slightly to the right and then tighten it), a cable bridge.
install/connect (the pins on the switch are labeled - terminal 15 or 75x).
(Short circuit terminals 56a and 5

and then plug the switch back in.
It would be interesting to know how that is implemented as a standard feature in the vehicles.
"The issue has been resolved for the devices that are being sold with this feature in these countries."
Is it possible that there's only a modified, country-specific version available?
"I've installed the light switch, and wouldn't it be the easiest thing to just..."
Then just get one and plug it in?
A solution is available from Hella:
http://www.hella.com/produktion/HellaDE/WebSite/Channels/Autofahrer/Fahrzeugspez_Prod/VW_Golf_IV/Tagfahrlicht/Tagfahrlicht.jsp