Clarke said this 5 times before and nothing has changed in his 20/20 game.
As you said though, changing mindset for different forms of cricket shouldn't be too hard to do.
For what it's worth I thought he could play a role too. I can see a lot of merit in having a more correct player who tests different aspects of the fielding/bowling side eg. pushing fielders for 2s rather than onto the fence, playing more 'correct' shots. But a player like that needs a low% of dotballs and Clarke has a few too many at present.
Poor little boy, poor little Clarkey.