It can just be lingual franca. Many African nations such as Somalia use Arabic as a link-language between multiple ethnicities.
Somalis don’t contact Arabs at all. They live in their bubble: going around wearing thawbs speaking Arabic. They benefit by having a proper, robust, rich language that anyone can use in the country. And it’s not pure Arabic, it’s their flavor of the language.
Pakistan can have a dialect of Arabic mixed w/Farsi & regional words.
Arabic can ease International relations, rather than consist with isolation. Perhaps promote intermingling + cultural exchange of movies, shows, media, etc.
I think a decade is enough time for such transition.
Year : Action
1 : Associates degree in Arabic becomes mandatory for all students
2 : 100 Arabic words/phrases are introduced into Urdu replacing old Sanskrit ones
3 : Bachelors of Arts in Arabic becomes mandatory dual-major for all liberal art majors
4 : All Grades 1 to 10 must have a class every year in Arabic
5 : Arabic/Urdu duo-language newspapers & menus become mandatory
6 : 500 Sanskrit words are replaced w/ Arabic
7 : President & PM & all politicians to speak only in Arabic
8 : Late adopter Arabic training to be provided
9 : All media, papers, etc. are to become Arabic
10: Medium language in all schools & colleges to become Arabic