There aren't any aftermarket parts that are made for the L2.
However, if you are so inclined to break the adhesive holding the bezel shut you can open the head, remove the stock lamp assembly and add a P60-sized drop-in.
The drop-in will rattle since the P60 reflector size is 26mm and the Pentagonlight size is 27mm, but it will function fine because the lengths are the same.
If the drop in runs hot it may overheat since it has no contact to the bezel for heat disipation.What if you put some electical tape around the reflector? I think that might tighten it up?