As your own comment indicates ('few Jewish scholars have explored, or developed a theology of, the New Covenant'), the 'New Covenant' is simply not an issue in Jewish messianism as such.  When that bit of Jeremiah is discussed in Jewish dialogue, it is never (as far as I know) with the nomenclature 'New Covenant'.  Even if it is true that that is the appropriate term and that it is an important issue in Jewish messianism, in the absence of serious citation otherwise, it would seem to me to be original research.  Neither the term nor the link to the article, therefore, have a place in an article on Jewish messanism, except as a compare and contrast with the Christian notion(s).  (By the way, keeping in mind that Wikipedia is not a forum, you are mistaken about converts to Judaism.  See our article on the topic.)