Interesting mod but due to the differences in wiring especially color coding and differences in DRL operation between Grand Prix year models ('97-'03) you'll need the GM FSM wiring diagrams for your year to reference. Off the top of my head I am not aware of any published mods. The most popular one is getting the fog lights to stay on with the hi-beams. See link below. Even this one is alot of work.
http://www.scacgp.com/mods/flswitch.htm