I recently got my E3 violet (after 7 & 1/2 months wait) and had to perform surgery on it to get to work, and then to get it to keep working,,, but, back on topic, it is easy enough to disassemble the E3 and get the LASER module out of it (and to remove the lense assemblly) and I assume the same will be so for the E2. BUT, the Lense on the end of the module is about 1/3 again bigger than the lenses in the Aixis lenses. Given that, I don't think that your plan will work too well. You'll be able to tell by removing the end cap on the lasing end (not the battery end) of your E2 and looking down the barrel. You'll easily see the objective lense. If you decide to continue, 1) using something thin (like a single edge razor blade), pry off the firing button on the side of the tube, 2) look down the barrel, you'll see the bonding agents (glue) used to keep the module in place, at the end of the module (there will be some that is white, and some that is clear, like super glue), using something like a dental pic, scrape the bonding agent off of the end of the module, 3) remove the battery cap and batteries (should have done this first,,,), Using something like an unsharpened pencil or a wooden dowel, place it down the tube and compress the battery contact spring, 3) with the spring compressed, tap on the end of the pencil/dowel until the LASER module is loosened and comes out the other end.
Congratulations, you have just VOIDed your nearly useless WL warranty.
Disassembley of the module is fairly straight forward at this point (I still advise against it, but you have been warned and are on your own). Good luck.
Re-assembly is even easier, if you have not disassembled the module. 1) notice on the black switch support the impression left by glue from the button. insert the module, spring first, into the front end of the tube (called the barrel earlier), aligning the button impression with the oval hole in the tube. 2) push the module down into the tube untill the impression lines up with the hole (be sure to NOT get your fingers on the lense, avoid smudging the lense), 3) with the impression lined up with the hole, put A LITTLE superglue on the rim of the module in the tube (again being careful to stay away from the lense), don't move until the super glue sets 15 to 30 seconds ought to do. 4) put a small dab of super glue in the center of the button hole, in the center of the impression, and put the button back on, 5) put the end cap and battery cap back on, in thier respective places, and you have an assembled E2/E3.