Sirius was a different type of vehicle. It was an MPV and Pakistanis don't generally like buying MPVs. They would rather buy SUVs, crossovers or sedans. As we can see that APV is also used only for commercial purposes. Launch of BR-V has created some market for MPVs and people have started buying MPVs for families, but it's a start. When Sirius was launched, there was no market for MPVs from a new brand, and the price difference between Sirius and APV was not that big.
R7 is a crossover. Pakistanis have started buying crossovers due to the market created by Vezel. This segment has become the poor man's SUV. Now, after Vezel, Honda launched HR-V, Suzuki launched Vitara and BMW launched X-1, all in the same price bracket, 3.3-4.0 million.
Let's assume R7 is priced at 2 million. With the feature set it is offered with abroad, it will be at least at par with the other new crossovers being sold in Pakistan, and there might be some extra features which are removed from Pakistani versions of these crossovers. The price difference will be from 1.3 million to 2 million. This is a huge gap. There are people who want to buy crossovers, or by extension, SUVs, but end up with sedans because they can't afford SUVs or crossovers. Those people will have a choice of buying a new crossover in the price of a sedan, with all the goodies the other crossovers offer. Also, the R7 offers more features as compared to the sedans in this price range, which can also attract sedan buyers. The fuel economy of R7 is also much better than the sedans offered in this price range, which can be just another reason to buy it.
If marketed right, I think the R7 can be as good as the V2, if not better.