Unfortunately it won't just swap. The lamp monitor and other DIC stuff is on a seperate connector that an SE won't have in the wiring harness.
Not 100% sure, I think the main connector is different as well.
Since you like projects.... it may be possible to use most of the stuff w/o the DIC lamp monitor if you swapped dash wiring harnesses. You might have a little rewiring to do if you have the manual HVAC controls. I'd say spend some time with an FSM and try to determine the feasibility before buying parts or starting into it.
00 Regal GS: All kinds of cool stuff.