Dont suppose insignia headlight washers are any more frugal? if they even remotely fit....?
I have been wondering about modifying the timer module to give a shorter squirt... (Or taking it out for no squirt at all and keeping a cloth in the boot.) 
Kevin
short squirt would be good, but certainly on mine there is too much fluid used, i think mainly becauase there is also fluid leaking from the ball socket around the washer jet itself, i've tried adjusting them so they sit at a flat and square to give even seal all the way round, but no better...
....i would like to keep 'some' fluid flowing as designed, wondered about fitting new head light jets as well, or if a lower powered pump would work?
but as you say, the hl washer timer is set no matter how long you hold the stalk.
not just an omega problem this, saw a certain german make car at dusk, three cars up on the m4, huge cloude burst in front of it, i thought it had burst its rad or something. But no, just the driver cleaning his screen and showering the screens of all 4 cars behind it. Bless, so helpfull.