I suspect that your boot manager can't see the hd0 copy specifically because it is a copy. I would almost bet that if you were to do a clean install of the original setup file to the hd0 partition (using a different key which you can get from MS just to be safe), then EasyBCD would see both instances of Win 7 RC and XP. From there, just use EasyBCD to set the boot order, and when it is set to (1) Win 7 on hd0, (2) XP on hd0, and (3) Win 7 on hd2, check to see that you can enter and exit from each instance without incident. Then you can delete the hd2 instance.
Whew. I hope that helps. Again, good luck.