In addition to all of the above as evident reasons why this would be extremely likely to never occur, a few more:
1) nuclear targeting is not a casual matter, and is usually done well in advance/permanently due to a variety of reasons including doctrine, hardware limitations, obvious security aspects, etc. This means that any such plan would also exist far in advance of its execution, being communicated through the chain of command, etc. Which in turn means much increased exposure to this whole concept leaking out one way or another. Can you imagine the results of this being discovered?? They would be diplomatically catastrophic on every international and domestic level for anyone involved.
2) even if it was plausible, the most viable way this would happen is probably via SLBM. Most boomers are constantly being tailed and tracked by all manner of navies, so it's not often a major surprise where they are located. If a French boomer starts relocating to the Caribbean, it's going to raise a lot of questions probably long before it gets there.
So while this is a fun, technothriller idea, there's so many practical obstacles that it just seems absolutely crazy. The one exception might be a false-flag terrorist attack. But again, the risks to planning that, let alone actually executing on it, are enormous in any number of ways.
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