I've used Mrs Pedro sewing scissors in the past(looks over shoulder:eek:) keep it square, should be no debris to worry about.
Push ins work great,, and can be reused,,
while you're thinking along these lines,,
why not buy a couple of push on schrader valves to keep in the car on a "just in case" basis,,
you can always use them to inflate the bags if the compressor fails,,;)

