To be honest, you sound a little paranoid. (no offense )
Nothing's 100% safe no matter how many measures you put in place. There will always be - very rarely, simple bad luck.
I just use common sense.
Unflashy plain black bags or peli’s, not flashing kit about, etc.
If I'm in a hotel I'll stick the back & body with a lens attached to it in the safe, if there is one.
Always empty the car of the important bits and make sure you pull the security cover over etc.
I think you have to realise that you are actually the only one who really knows the contents and value of what's inside your case, and that to anyone else it's just a back pack or a case - Aside from other photographers, you have to remember that it won't even cross most peoples mind as to what the case/backpack is - that's if they even notice it at all.
I carry my core kit in a LowePro computrekker, and to anyone but us lot, it simply just looks like a black bag. Period.
In the incredibly rare event of the worst happening, which is genuinely out of your control - well, that's what proper insurance (kit and indemnity, re shoot scheduling etc) is for.