The 'one finger blow' is a new term for me. I've always referred to it as the 'Asian Kleenex." If you've spent much time in Asia, you know what I mean. It is the only way t keep the intakes clear. I suspect it is a common practice as most gloves have a soft cloth in the strategic position...
I find it only works well to clear the left nostril.
Our group stopped at a small town eatery once and when everybody else had gone in I looked up the street, looked down the street and let loose in a pile of leaves in the gutter.... and then realized the three retired-age ladies in the car 5 feet from me were chortling hysterically...
I'd never be able to find a hanky.
Come on, it's not that bad... If I'm riding fast I'm not going to bring along a whole pack of hankeys, and what's so wrong about an occasional spit or whiping of the nose with your glove. Those can be washed, and I dont think the bushes will mind my spit.
I must confess that I rarely use the rocket, the risk of hitting yourself is a bit high. ;-)
I always do the one-finger blow method. Every time I ride I must suck in something that causes my sinus to drain. I blow for a few minutes then finally am clear enough to breath through my nose with mouth closed. Mouth closed I don't get dry mouth and suck up so much water from my bottle.