a real example, if as posited upthread, people are resisting having their loved ones pursue cryonics because it denies them a sense of closure.
Well, one person. And not "resist", but "highly uncomfortable with". And "may (tentatively) be part of the underlying objection". You are adding lots of certainty which is entirely absent from the OP.
I am still interested in your normative position, though. So let's get back to cryonics. Alice and Bob are a monogamous pair. Bob dies, is cryopreserved. Alice is monogamous by nature and young, she feels it's possible that Bob could be successfully thawed during her lifetime.
What, in your opinion, is the ethical thing for Alice to do? Is it OK for her to remarry?
What, in your opinion, is the ethical thing for Alice to do?
Use some clever rationalization and remarry. More rationally, she should be aware that the probability of Bob being resurrected during her lifetime is pretty low.