You are facing the same issue what Imran faced few days earlier,I would suggest you to leave it for few hours but if you still want you can go for client deletion from OS level,it would be quite faster.
Me and Imran had a quite detailed discussion on this topic and he was finally able to delete that.
Please refer to following thread for full procedure of step by step procedure
for doing this cleint deletion and let me know of any questions
i go through that link that u mentioned, what imran had did that he deleted the client through r2trans at OS level, but i m doing with SCC5 thats the difference .
i checked in SM50 and also in mmc, both is showing the client is deleting but in actual the table cclstab
had struck for last day... i stopped many times mmc but the status is same
so how i delete that client