Yeah, you basically are forced to use an external flasher. I would use a Whelen
UF8. I just grabbed one for $75 shipped on ebay.
You need-
2 frames
4 lens sticks
4 endcaps
4 Freedom corner LEDs
2 400 series LEDs
4 micro specific brackets
2 stud or direct bar mounts
Wiring
1 Flasher
I have the frames, the brackets, the flasher, the wiring, and maybe the mounts if you want them. I can tear them down or I can just sell you the complete 9M micros. They're just strobe instead of LED and they would give you an idea of how to switch out the parts into LEDs.
You would need to find the LEDs, endcaps and the lens (you don't need much lens maybe 2.5 inches each side).
It's something to think about. I'm not going to be doing anything with my 9m micros so they're not going to suddenly go away.