I don't understand why there would be debris in the lens? It's a solid acrylic lens. If there's debris in there it was made that way. Otherwise, take it out and wash it off.
I modified an old clip today for the Alpha. It's not perfect, but it works. I thought I'd post it in case anyone else wanted to do the same. I'm not 100% sure what this clip went to. I think it was a Zebralight. I had to thin the legs down to make it fit. It slips on between the tailcap and body.