Sharia law is not just a legal system but a complete system of Governance.
For instance:
1: Islamic courts ( Persecution , Legal process with Qazis , Punishments and change in Police station layout and complaint handling )
2: Shura ( Parliament ) Islamic council for national decision making or in other words Parliament would work on " Votes " in between elected members and the percentage would be kept higher that the decision once made have less chances to be challenged. MP's will still be elected thorough Elections but the requirements to contest the elections could be changed such as if someone is convicted once in any offense would not be able to participate , Bachelors degree , For ministries or departments relevant experience in that field. ETC
Parties would be encouraged to chose their ministerial nominees before the election process that people know who is going to lead the country.
3: Banking , Taxation and Health systems: Islamic taxes could be merged down with already existent taxes and a Tax return process can be put in place for tax payers.
Halal banking and Health facilities for everyone .
4 Educational system: School modernization , change in curriculum , Basic Islamic education from age 4-6 followed by modern education from grade zero to the College level .
More separate universities and schools and research centers for Females and Transportation facilities .
5 Command and control & law enforcement :
Not much change in the infrastructure of armed forces but just a bit more centralized and interconnected force that can work together with law enforcement organizations such as Police and Intelligence .
6 Zakat & ushar system: Collection and distribution of zakat and usar in a digital manner to make sure it gets to the Needy.
**There would be room for improvements in every sector such as Industrial , Foreign relations , International business , ETC.
Regards: