I have installed quite a few pocket clips on Alephs. The ones that I use a stainless steel and I get them from a knife maker's supply site on the web. They do need some doctoring to fit the curvature of the light bodies, but aside from that, all they require is drilling and tapping.
I also have some Ti clips, but I don't have the time or patience to mess with the final finishing required on those.
I don't want to speak out of turn, but I did send a couple of these Ti clips to Ginseng, and what he did was very nice. Of course, I don't know that he'd be willing to do anymore of them, nor what he would charge.