Indeed it is very similar across all the clone sites as well.

It's an indication of how I do things though that I never thought to mention locked content in my post!

You definitely cannot migrate an Open ID account at DW, but I wonder if you could upgrade and then rename? Rename tokens are fairly new here. I think you might be able to do that at LJ as well. (To anyone reading along, I am not sure about this, so do some digging before you assume it's true.)