I love those thumb switches. They're effortless -- I had a CB550 that had more standard switches you had to change the position of the hands to get to. The turn signal config is on of the main reasons I stick with the K75. Isn't that where your thumbs naturally hang out out? But I dunno, maybe my thumbs are deformed.
The other reason to make that mod would be because the OEM combo switches are expensive and the second-hand ones are getting old.