Am I misunderstanding something here, or is your issue that it's possible for the safety to be unintentionally disengaged, and an external object to activate the trigger? Is that not an issue for literally any rifle with a physical safety switch?
The R8 is more like a cocker/decocker than a traditional "safety", right? But for the remaining models, how is this different than the Tikka? They're physical safety switches, and yes, if they were inadvertently switched to fire and the trigger was pulled... the rifle would fire.
You don't have to carry one in the chamber if you're this nervous about it. If I have one chambered, then the rifle is in hand and under control. For the safety to come off, and the trigger to be depressed, and me to lose control of the muzzle all at the same time...
Seriously, am I missing something here?