Unfortunately, when I generate the codes for Locale-Codes, I get them
from the standards, and those standards contain current information, but
not historical information.
So the immediate answer is: no, this is not possible.
However, I can see some good arguments for including this functionality.
I'll have to give it some thought... if it can be implemented in a way
that doesn't involve a complete rewrite, I'll add it.
Just a note though... I doubt I'll have time to implement it in the next
few months, so I wouldn't expect to see it for 5-6 months.