2008 Buick Lucerne Rewire power accessory outlets

I don't quite understand why Buick doesn't shut off the power outlets when the car is turned off.... but they don't. Everything I have plugged in...Serius radio...Car cell phone etc... I want to be turned off. I don't want to have to switch these things off myself. The outlet I use is under the drivers seat.

Question..... The fuse box is under the back seat... I am familiar with electrical wiring.

Will there be a problem to rewire?....remove the fuse and place a jumper to a different fuse that is turned off?

If so, what would any concerns be? All devices I would plug in wouldn't cause much current draw.

What fuse would you recommend connecting to?

Would there be a different way to go about this?

Thanks in advance

Don Seibert