There is no need to change any rule imo. Quick solution would be.
Organise the T-10 WC and in the very first edition let India-Pakistan to qualify for the finals, followed by India winning by fine margin. Voila!!

After that BCCI will take care of everything.
LOL.. if that happens, then the BCCI will convert IPL to a T10 league. Instead of 10 teams, they can have 20, and that alone should bring $10 billion in franchise fees. Total number of matches will just double, and advertisement slots will get sold for record amounts. Even tier-2 cities such as Dehra Dun and Guwahati can have IPL franchises. But the big question is whether there are enough local players to support 20 teams. They can increase the overseas quota from 4 to 5, but even then the remaining 6 players need to be locals.
They are planning to make IPL 90 days affairs from next year or so.
If by any chance this T-10 scenario ( it was supposed to be a joke on how BCCI hijacked the T-20 format completely) pans out then BCCI will push for another 1 month dedicated window for T-10 format.
I would love to see representation from associate nations too in 5 overseas players category.