If his nipples are male sized, if he has no droopy skin, and if he is an A cup, he really may be able to get away with just liposuction. The only downside is that men's nipples are higher up on his chest than females.
The other sugery option with less scaring than the typical double incision is the keyhole. I can't imagine that he wouldn't be a candidate for this and there is less scaring.
His doctor will be able to tell him his options based on his chest.
He should check out this site where he can see pics of the various surgeries.
http://www.transbucket.com/
Also, this site is helpful to any transman
http://www.thetransitionalmale.com/
And this:
http://www.ftmguide.org/
You may want to encourage him to come into the thread if he has further, more detailed questions.