Another similar hack I discovered. You can get a full blown MSc with no attachments such as (open) from The University of Liverpool [1]. You can gain entry if you have enough experience to skip the prerequisites. Costs are similar. You could pull it off in 2 years if you worked like a champion.
Someone I follow on Twitter said they're doing this course and that it's OK but the quality of the other participants is a little meh ;-)
On the (Open) suffix, I don't think there's any requirement to include that part. You've been conferred with that part of the title but I can't see any reason you have to use it - it's still an MSc. But perhaps someone with insider knowledge could correct me here ;-)
[1] http://www.liv.ac.uk/study/postgraduate/taught_courses/softw...