Re: No-Knot Fas-Snap, have you ever used it?
I've never used these, but I think if you find yourself changing the size of the snap and tippet often, you could tie up some different sizes before you even go out on the water. Just match up the smaller tippets with the smaller snaps and you can work your way up through the different sizes, tie them up with loops on the end and you should be good to go!
I like to tie as much stuff up as I can before I even go out. As long as you always have loop to loop connections you can save a ton of time from bumbling around trying to tie knots with cold, wet fingers...