Good article. I agree with a lot of the stuff. I actually have a different cosmetic loadout on each of my 4 Demo loadouts. First is normal Demoman (demolition stuff), second is Demoknight (Scottish cosmetics), third is Sticky Jumper (changes between cowboy and rastafarian), and fourth is a wildcard. Right now it's a stereotypical Mexican and I go around smashing people with a bottle.
But yeah, it's amazing what you can do when you just aim for a theme and try to make it. Like right off the top of my head I can cite a dozen combinations for Demo that range from sci-fi, western, urban, military, Scottish, and everything in between.