If you really want something close to an A2, try this:
(poor man's hack - no tools required)
Grab an A19 head kit from the shoppe:
A19 head kit
Grab an McR-18 or McR-18J reflector from the shoppe:
McR-18
Now, cut a strip of electrical tape and wrap it around the McR18 and slide it into the A19 head. It should fit snugly. It will also probably be misaligned - but not to worry. Screw in your light engine and assemble your light. The LE will seat the McR18 head and push it up to where it belongs. Since the A19 has a long barrel (and the McR18 reflector is short), it will end up about 1/2 up the head.
First, adjust the LE to make sure you have it screwed in enough - or back it off if you've overtightened it and you have no light. Remember the reflector is free floating so you will have to gauge it by function. Then, turn on the light and adjust the reflector (through the front end - sans glass) until the beam looks just how you want it. Once you've got everything perfect, place a few drops of epoxy around the edges of the reflector to hold it in place. After it dries, put in the O-ring, glass, and screw on the bezel.
Tadaaa... you now have an "A2 like" beam in a fully Aleph-compliant head.
-Chris