referencing choices tuples

I have a typical set of choices tuples that are then referenced in a choices=... reference in a field definition. It does, well, what it is supposed to do.

But, I have a situation where I need to change the value of the field to "a different choice" in code in the view (rather than as a from choice).
It seems like it should be trivial but, for some reason, my brain is not creating the right code.

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