I am really pleased to be reading 2000ad at the moment. I like everything in it. Even Bec & Kawl. I was a bit surprised to see Thatcher turning up (after all, she's in Hell but she's not even dead yet, and it's hardly topical), but then I thought "what the heck - she's a bastard and I hate her". It was off the wall enough to liven up a strip I don't have much fondness for as a rule, so good luck to it.
As far Caballistics Inc., I think the reason it bears comparison to Hellboy (and for that matter, Scooby Doo) more than League of Extraordinary Gentlemen, is that Hellboy works for a US government occult investigation agency (the BPRD).
One thing that makes League of Extraordinary Gentlemen really clever, and which is hardly ever commented on, is that Alan Moore doesn't appear to have ever given any indication that novels and works of fiction exist in the League's world.
It appears to rest on two premises: 1) that in the world of LoXG, every single work of fiction is more or less true simultaneously, and 2) the authors of those works of fiction, and the works themselves, do not exist in this world along with their characters and situations.