I think Emmett and Killian are great for brothers! Please don't be put off by a minor character in Twilight. Emmett has a long history pre-Stephanie Meyer and doesn't deserved to be shelved because of her crappy books. I really believe (and I don't think it's just wishful thinking) that the Twilight books don't have what it takes to be classics; they're too poorly written, too easily dated, and in a decade or so, people will be looking back wondering why they were so obsessed with them--like Swatch watches, Cabbage Patch Kids, or AOL.
I'm not crazy about T- middle names with the -t ending Emmett, but honoring trumps that sort of thing. I prefer Emmett Trayer slightly.