I really have to remember that frame for cryonics.

Don't forget that if it works, you probably get immortality too. If you were already immortal, would you be willing to become mortal for $500 000?

I'm not sure if this can be reversed just like that. If the immortality is possible at that world, you could just use part of that $500 000 to spring back to immortality, and I'm a bit unsure about how denying that affects our hypothetical situation and how it compares to the original dilemma.

But this would be quite close to the original for someone whose lifespan is almost over, so that money doesn't have the time to change anything else for him. Still, one point that makes me wonder is that comparatively, we'd expect $500 000 be worth much less in the world where immortality is commonplace enough for you to have it, whereas now it's really much. Do we assume that in this new world, $500 000 has same comparative edge as it would have in our world, or in other words, amount of money/people in the world remains the same?