If the Copenhagen interpretation was real then Russian Roulette would get you soon enough.

Only probably. Bullet could quantum tunnel through my head, for example. I don't know if you understand the original quantum suicide thought experiment very thoroughly.

you perceive your existence continuing 100% of the time (but your head may be bleeding/brains still thinking while splattered on the wall, etc.).

Nope. I have a naturalistic definition of "me" - if my brain is splattered on the wall, that's the end of that story. But that does not mean quantum immortality can't satisfy any definition of "me" I choose to use - see quantum tunneling, above.