I have an even quicker way to pump up my kite.
Firstly I made a connecting piece that joins my tyre inflator to my kite valve.
Then what I do next is the clever bit, on the way to my local I stop at the petrol station and use the compressor to fill my spare tyre to around 120 psi.
At the beach I roll my kite out and connect the spare to my kite and in under 10 seconds my kite is inflated.

Only downside is there is no time to lay out the lines and I burst my 7m because I forgot to reduce the spare tyre pressure for my smaller kite.