Red dot,
I removed the plastic lens so as long as you're careful not to scratch the optic, the light should be fine. Unless you have tools to bore out the head, I don't think there's an easy way, if there actually is, to retrofit a reflector and a lens. A rather easy mod I did was installing a DB1000 to make the light regulated and swapping out the led with a TWOJ. I think the stock led is just an S bin.
Theepdinker,
Just remove the oring holding the optic in the head and the optic should drop out easily.