@Spry:
You are rather straw-manning the pro-Confederate "nationalist" conception I've forwarded thus far (which as I should note, I neither endorse nor attack - I merely think it's the logical consequence of Confederate/French history). This is not a sudden reversal, it would have began at the end of the Rhine-Rhone War, when it became abundantly obvious that the threats of violent ethnic separatism (German/Italian Brotherhoods) as well as the violence of other states claiming ethnic marginalization because of the policy of anti-nationalism, could not be addressed by simply MORE anti-nationalism.
When I suggest that there exists a Confederate nationalism, it's not because I expect Confederates to refer to themselves as nationalists (at least not at this time), but that in all basic functions it is a kind of nationalism that co-exists with the regional-national identities of the Confederation's member states. What makes the Confederation special is that it's nationalism is inherently built to defy all the problems of nationalism (which the old Confederation's anti-nationalist policies were trying to combat).
War between competing ethnicities, tension within states between such groups, discrimination, nonsense stereotyping, and thuggery by rebel nationalists, are all problems that a Confederate identity, even if itself a nationalism, still addresses, by making peace, security, democracy, secularism (in short, liberal democratic civic goals) it's primary solidarity, over simple ethnicity.
Septembrists can, without being inconsistent, still violently argue against (ethnic) nationalism in general, while being patriotic for their own Confederate nationalism, because this Confederate nationalism is designed expressly to fight those basic problems of other nationalisms.
Final note: again, this is purely analysis of what I consider to be a valid, and probably popular, self-conception of Confederate identity. It would follow from this, that a kind of inclusive multiculturalism could flourish, in which regional-national identities are recognized, but subsumed under a more noble Confederate identity (again, merely a hypothesis).