Dont go for the meter replace as always a hassle for the odometer reading on the new one and the old and even if you change them most people will have an issue when you sale the car as they wont know the original mileage of the car.
Climate con would be a very big project, you you need the sensors and so much wiring and stuff it would almost impossible to do that, same goes with push start. Dont splice all the wiring and tap into the immobilizer and stuff its just too much of a hassle.
For the shape and all just be sure to check first if the facelift parts will fit bolt on. There are sometimes fitment issues like the people who tried to facelift 2009-2014 city to the 2015+ city and guess what rear lights dont fit bolt on so do a little research first before buying all the parts.
I also intend to get Projection (Turbo Rs) front lights for my simple Alto but need to research first are they bolt on. Do they have the same wiring clip. Projection ones are non-adjustable and my current one's are so wiring could be different so need to study a lot of stuff before going for it