You'll need very big tanks...that cylinder will displace the same amount of air as it does running on fuel...a lot. High pressure gives you more, sure but how do you refill that?
You can test your idea with an oxygen tank to a set of torches easy enough with a regulator. I believe they're around 3000psi. Not sure.
I hope you have luck with it, it's just that refill thing I'd hate.