Can I take off the gas deflector on my stove for cooking with a wok?
I've never heard of anyone trying this. I think its very unlikely though. Those gas deflectors are actually specially designed to pull in the appropriate amount of atmospheric air for a proper flame. This is why the flame you see is so blue and has very little orange.

I'd look into seeing if there is some way to get a replacement deflector that is better suited for wok cooking. 

You could also do what Alton Brown does and use the bottom half of a turkey deep fryer, outside preferably, and not over any pipes or electrical wiring or gravel.