Any Southern nationalist movement, especially one that wraps itself in the Confederate flag, is going to be viewed with suspicion, given the historical record.
But I still do believe that there are useful things to say about Elvis Presley, including what his own ordinariness as a poor Southerner says about 20th-century hero-making.
Maybe we've been brainwashed by 130 years of Yankee history, but Southern identity now has more to do with food, accents, manners, music than the Confederate past. It's something that's open to both races, a variety of ethnic groups and people who move here.
You ask people what their ethnicity is, and a lot of Scots-Irish people either don't know or if they know it they just don't acknowledge it. It's not something they really identify with. They're just plain old Americans, plain vanilla. I don't think they are a self-conscious voting bloc.