I read what you wrote about not being able to change your username, and wanting to hold on to your 7,000 points. I understand that it's not desirable to lose your points for such a simple reason.
However, I think you should consider the possibility that the net benefit to your points over the long-term that you would stand to gain in the future by switching now to a username that doesn't sound like spam could be a lot more than 7,000 points.