I've been on a couple of LED sites and you can get dual light LED's, so one would imagine that it is quite easy to carry out. That is how I plan to do it. The wiring would be simple enough.
p.s. this would fesult in you still having standbye lights, with the second diode circuit used as part of the flasher circuit, which would be incorporated with the Gregg Flush mounts, which are pretty nice I might add.