Why don't we make it a bit more interesting ?
Each team plays 6x2 = 12 Group matches.
7 matches, they can play 5 overseas players while the rest 5 will have four.
Let the team management decide which 7 is more important to them.
How they play their card and formulate their strategy will be very crucial which could alter the final scenario at the end of the group stage.
Semis and Finals ?
The team management will have to decide before the game and submit to the tournament committee and be stuck with that format till the final, whether its 6+5 or 5+6.
Verily, in the remembrance of Allah do hearts find rest [Al-Qur'an,13:28]