Reference URLs for language subtags?

Is there a stable URL for seeing all authoritative information about a
BCP47 subtag, i.e. the registry entry plus the final registration form?

For example, https://www.iana.org/assignments/lang-subtags-templates/rm.txt
mentions that it updated a previous version of the record, but it would be
nice if that previous record (and anything else relevant for this BCP47
subtag) could be displayed on the same page.

Another example is the deprecation of language tag i-ami by ami; it would
be nice if https://www.iana.org/assignments/lang-subtags-templates/ami.txt
and https://www.iana.org/assignments/lang-subtags-templates/i-ami.txt (or
some other stable URL which works for any BCP47 subtag) had the story.

This would be useful for Wikipedia and Wikidata, so that Wikipedia pages
could refer to authoritative information about BCP47 subtags. For example,
the infobox in the Wikipedia article about Romansh [
https://en.wikipedia.org/wiki/Romansh_language] has a footnote next to the
IETF language tag. The language tag and its reference are taken from
https://www.wikidata.org/wiki/Q13199#P305 (click on the reference to expand
it). Problem is, there isn’t really a good reference with all the
information, hence the question.

Best,

— Sascha

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