This is the guy that developed it.
http://cominolli.com/product_info.php?products_id=29
And here is a list of installers from his website.
http://cominolli.com/mSK%20Installer%20list.php
You can also buy a kit if youre feeling DIY about it.
And, No. It doesnt void the warranty.
I was thinking of buying a G26 and having it done but then the MP9c came out with the thumb safety and it felt better in my hand too.