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[TD="class: alt1"]Finally! After waiting forever, I finally got a hold of the required parts and got this done at last (I copied the write up I did on the Yarisworld)
OEM airbag cover (for multi-function controls, also airbag cover for the Belta and the Vitz is different as both have a different texture on the cover).
OEM multi-function button/switch assy (now there are two types, left side controls have track up and down, volume up and down and MODE with the other side empty and the other one has all these features on the left with the Bluetooth/phone connectivity on the right with call end/receive and voice command). I got the one without the Bluetooth functions as my head-unit doesn't have a Bluetooth option.
OEM clockspring which supports multi-function controls connection (I didn't need another clockspring, my audio guy made a harness and installed it with the original clockspring).
Also, there is this neat feature I didn't know existed. If you hold the MODE button for 2-3 seconds the head-unit turns OFF and when you hold it again it turns ON, I found this feature to be highly useful. It keeps you from diverting your attention whilst driving.
Special thanks to @akramzahid for giving me the airbag cover at a discounted price and replacing the airbag assembly from the old cover into the new one without any charges. If you guys want these parts @akramzahid is your guy to contact.
Here are some pictures of the parts and finished product, just have these low-quality cell phone pictures for now. Will post detailed pictures later.
Required OEM airbag cover
Required buttons/switch assy
Original airbag cover and airbag assembly removed
Old airbag cover (notice the difference between this one and the new one, you cannot fit the switches in the old one as there is no open space to do so)
The airbag had to be removed from this old airbag cover into the new one. The airbag assembly is bolted on by steel rivets which have to be opened and then closed by a special tool which I didn't have. The guy whom I bought the parts told me he would do it, so I couriered it over to him.
Final product pictures, will post detailed images and a few video clips over the weekend.