I am sorry but when people want to localise Klingon in the Klingon script they are welcome to it. This has nothing to do with the language policy. It is up to the people at translatewiki.net
to decide on that. In the past their requirement for Klingon was that it had to use the Klingon script.
The scope of the language committee typically ends with the creation of a new project. However, in the past we did recommend for the closure of wikis when the language used was NOT the language advertised. The removal happened in the end.
We do and did get involvement in the addition of new languages in Wikidata for ISO 639-3. The purpose was that they did not wan to add all languages and having a process where the language committee wisely nodded is what we have. This is for ISO 639-3 only.