I'm not too sure because I don't know very accurately the electronics inside, but I guess that it could be done. I'm not sure I'll be very clear here, so tell me if it's not understandable.
As far as I know, usually with such buttons, you press the button on the hilt, which presses a button on the electronics inside. However, if the activation button is in the hilt itself, and wired up to the electronics, then it could work.
But don't take my answer for granted. I have limited knowledge of electronics and am currently learning