1. Valuables....well, no...but you can pack a pair or three of skidmarked drawers right there at the top so they’ll see if when they open it. Had a buddy that did this for years.
2. Forget the photographing stuff. The baggage handlers and screeners would likely just use the photos to post on E-Bay when they sell your crap.
3. Buddy system....yeah....possibility though if one of the TSA Sherlocks spots those knowing glances betwixt the two of you, they’ll think something’s afoot!
4. Skip the bins....belts? shoes? overcoat? Jacket?
5. Lock your bags....hell, they’ll just break the locks and steal what you have if they see something nice on the X-Ray..
6. Colorful baggage...I suggest rainbow colored. Add a Gerbil catalog inside for good measure.
7. Double check carry-on.....don’t worry, TSA will do that for you and surreptitiously remove anything of value if they can get away with it.
8. De-plane quick - no potty break.....well, I can tell you aren’t an old man....
As for your first suggestion... I know someone who does that as well. Leaves visibly dirty underwear right on top. He’s never had a thing stolen.
When I fly with my family, I make sure to go through first. My wife doesn't put our carry on bags on the conveyor until I'm through and waiting for our stuff on the other side. It's not just TSA: regular passengers can grab carry on bags if you're detained and not looking at them.
I imagine brown show polish would be the best materiel to use for that.