Bad idea.
Brake fluid is hygroscopic. That means it soaks up moisture from the air.
By using pressurized air you are also pumping moisture into your brake fluid.
A couple of tricks I used when bleeding my front brakes from completely dry.
1:Master cylinder traps air so cracking the banjo bolt at the master cylinder to get the air bubble out from there helps if you don't have a bleed nipple there.
2:A vacuum bleeder sucks fluid (and air) without contaminating your brake fluid with moisture.
3: Most importantly, unbolt the calipers and hold them above the master cylinder (air travels up)