What you can do is, if you have a bicycle-pump with an adaptor to car-tires, pump the tires with that pump.
Will take 100 times pumping , but can do in this special situation.
bycicles also use high pressure, especially race-bycicles.
Some pumps even have a manometer on it, so you can see the pressure.
You can also use it on the road , because then its only to add a few psi , wich takes only 20 times pumping. And it always works , no need for electricity and good for your condition.