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There was some concern with PyImport_GetMagicTag() extracting its value from sys.implementation.cache_tag. One solution is to have the two use a common underlying value. However, that's basically what was already in import.c and I'd rather minimize that file at this point.
An alternative is to have the underlying value defined in a more amenable spot, but I'm not convinced that buys a whole lot over simply exposing the underlying value in PyImport_GetMagicTag(). If we could deprecate that function...
Another possibility is to move the underlying value to configure. The down-side is that it's platform-specific. I've attached a patch that does this. While it may do too much as-is, it demonstrates my point.