I'm sure it's entirely possible the problem right now is finding a decent reflector to get a good beam. The second problem is getting a decent tint and a P7 that lights up evenly. I'm working on find a decent reflector now. Otherwise if you don't mind artifacts from the bond wires a modded mini mag reflector can also work.
Other than those two points the mod is straight forward. Milky took another approach using no reflector or traditional optic. His uses a pyrex aspherical lens.
I wouldn't worry about the power pumped out to the LED as if you get a low enough vf emitter the dies will light up. It's how much current is pumped out that decides if it's a huge improvement in light output. I'm going to say that a majority of HDS EDCs and Novatacs should see at least 170lumens out the front assuming a CxxxH(740 - 900lm) is used.