do so at your own risk, thats my disclaimer
a docile squirt of easy start (spray for the duration of saying the word "Banana") should give the desired effect, just keep well clear when lighting and leave the tyre valve out to allow the excess to vent.
strongly reccomend the ratchet strap idea, i have re-inflated trailer tyres, my XJ600 tyres, a couple of fireblade tyres and even some 235/70/16 car tyres using that same method, its less likely to blow up in your face that way