Thank you so much everyone for your help and guidance. First thing in the morning I went to Toyota Islamabad and after doing several rounds from all angles of both medium sliver and super white corollas parked side by side, I finally have selected medium silver for Altis 1.6. The sales rep said that I might get it in April instead of May, so good news.
Delivery for 1.8 Cvti is within 45 days, but then I had to add more $$$ to it so just dropped the idea. I may go for it in future.
New Cow looks super $exy and elegant in black, but I have kept black for 10 years. Super White looks good only from just few angles, but medium silver looks better overall from all angles (my personal opinion after physical inspection).
I checked with Toyota Rawal and they said it is possible Grande's android unit can be installed but he guessed it was of 85,000 rs (too expensive) I think it is around 70,000.
Kindly check from this Facebook page of Corolla infotainment. They provide services through dealerships.