Do you mean the tax that is on fuel? In our country that tax is already very low. There can be multiple ways to collect tax, We can install a Sim in car and it will communicate its Total KM Driven in example 2020 and we can forward it to government to tax as per that data.
This will be easy to solve if car is designed for Pakistan
Yes there can be scams but i used to think the same that Pakistanis are not talented much as claimed. Until i arrived at my University in Islamabad and i saw how much practical knowledge do people have. You would be shocked if i tell you the company i am working for ,fresh graduates are delivering a project for Germany to build 100% Autonomous Cars (Like Tesla). We sometimes take things easy but the amount of talent we have you will be shocked if you meet them.