As for the DIY, it won't be that hard. You remove the wheel well cover, then unscrew the turn signal socket. Replace the bulbs, and replace the socket and the cover. Most likely OSS will use a resistor to offset the extra power that the LEDs won't be using, and where he's going to put that, I have no idea.
He could conceivably put a resitor on the bulb socket itself, or on the turn signal wire leading into the control unit of the headlight. OSS, can you clarify this?
This is how I solved the orange LED issue: