Worry, worry, worry!
Aren't we supposed to be showing DD our support? Don't give the guy even more to worry about.
1) Yes, it makes sense to remove the work from the site on publication. It only makes sense to remove the story that someone is paying for from tnbw, where theoretically, anyone in the world could join and read for free. Get that? Anyone in the world! It's obvious that doesn't happen, but remove it anyway, out of professional responsibility.
2) Forget changing names, unless you want to. It's not a problem with the publisher. Just make sure the publisher knows your real name, so they know where to send the money.
JP