If you're willing to go to heck and back there's some Java programs for configuring Airports:

http://bamajr.com/2011/02/01/kubuntu-configure-an-airport-base-station-in-linux/

Granted I merely know of them, never used them, they may burn your house down.

(edit: Actually I guess that's not true. About 11 years ago I used a Java app to config original grey basestations, this may be descended from the same codebase. At the time it... worked.)