A momentary switch

Hi! I'd like to come up with a switch which acts momentarily. Unlike any latched swtich, this one requires a single burst of static pressure value so as to produce an output signal and put in motion any schematics further. The same action is required to cease from working. In order to achieve this, a 555 timer working in flip-flop (bistable) mode is utilized. The schematics is attached. Because electronics does most of the work, the mechanical part is quite easy to implement. It consists of a membrane which is deformed under pressure excess thus enabling the clamp terminal. The backstroke is made by a spring. You may watch a video of the schematics, which has been made by means of Proteus, here: http://youtu.be/wf6H1wfDAX8 The overall assembly dimensions are 14x14x7 mm. Both normally closed and opened options are also possible. Thank you for your attention.