A code for standard Zhuang

There seems to be some interest in Zhuang Wikimedia projects*; looking at
https://en.wikipedia.org/wiki/Zhuang_languages and
https://en.wikipedia.org/wiki/Standard_Zhuang , it seems that Standard
Zhuang has no special tag. Presumably, it shouldn't be tagged za, because
that's for the language group (which is apparently not a linguistically
valid group); should it be tagged zyb, since it's based on the Youngbei
(zyb) dialect/language, or should SIL be petitioned for a new tag for
Standard Zhuang? I admit I'm an outsider here, but it does seem the issue
could be a question for Wikimedia soon.

*
https://meta.wikimedia.org/wiki/Talk:Language_committee#handling_languages_with_multiple_scripts

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