This is a hard one.
Now< I have to thin Suzuki. I will be going to a dealer and have a proper look.
However, you made a good start. You will find under the bonnet some bits and bops that are either for other models like brackets or have been left behind from assembling.
The wring loom is usually a one-fit-all one. If the car comes with more airbags than yours then there is wiring somewhere hidden. You will find plastic covers and other things in less accessible areas which aren't really needed.
Removing the exhaust and replacing it by some lighter more durable stainless steel saves quite some weight.
A lot of the bolts arefar too long, but sped up assembly in the factory.
More specific parts I have to look at the car as every model is different.
Sound deadening is another area to look at, but it will be quite some work as you have to replace it with superior materials that are lighter and then find out where no material is needed.