To a pretty real extent that's a big part of what defined radical Republicans, at least early on.
The reality of course is that any project like this is going to mean a long guerrilla war that the Union is ultimately not all that likely to win. There just isn't the support (anywhere) for the kind of commitment required to do this, especially since after a war that ends much like OTLs it's not at all about the Union itself anymore, and becomes truly an issue of rights for former slaves.
The only way I can see any real possibility of it happening would be a war that lasts a year or two, and is a real but rather short fight for the north. At that point it might be conceivable that Confederate supporters end up treated as traitors, with a much harder northern line on treatment, prosecution and pardons. Even then though I can see a hard line lasting for some time, but the decades of simmering occupation and guerilla warfare that would be needed to create something like a northern dominated south are just not going to gain support anywhere. For that matter, even if the north tried the whole thing seems like a recipe for another rebellion as soon one can be organized, and quite possibly the most feasible way to eventually end up at a long lasting Confederacy.