Originally Posted by BigChief

That's a good question. Can you "flick" instead of "snap"? Of course, I don't know, but the BSA hub does seem to be an exact copy of the SA X hub. Here's a picture of the SA X hub shifter. Same as the BSA and looks similar to the later quadrant shifter. I have seen people use quadrant shifters on AW hubs. That's a lot of ifs, but there's a chance it might work. edit..Looks like Low Normal and High would be backwards though.
SA X hub shifter