Last time I checked you can plug the USB side of the Lightning connector to any USB charger and vice versa, I'm pretty sure you can use the Apple charger to charge anything that also charges from a USB port. Seems to me that Apple would already be in compliance...
If an adapter that goes from [whatever port is on the device] to micro-USB would be enough to be compliant with the proposed legislation, Apple is already in compliance, because not only do they sell such an adapter already, the charger end of their Lightning cable also has a standard USB connector (which means it effectively is a Lightning-to-USB adapter itself).
I know the EU already talked about standard chargers for mobile phones even before the iPhone existed, because back then every phone used to have a non-standard charger plus attached, non-removable cable. The whole idea behind the legislation was that the charger got useless the moment you lost or replaced your phone, so lots of them ended up on landfills. Mandating a common charger would allow selling phones without a charger, and re-using old chargers with different phones.
Unless you can quote the exact bits of the proposed rules that say 'any mobile device will have a micro-USB port' (or whatever port would be considered even more 'standard'), I'm going to assume everyone is just getting all worked up about nothing again, because "OMG iPhone does not have micro-USB, make them add it!".
So I may be wrong, but I think this is about actually forcing Apple to provide micro-USB directly.
Apple will move, if pressed hard enough. I also think economies of scale will force the world to follow what the EU proscribes, just as the EU's lead free soldering requirements changed soldering (almost) everywhere, and just like California's emission guidelines affect cars (almost) everywhere.
* Because it's an active cable, not just a pin mapping.
* Because they can.