I do not see any reason to derive the name. Finally it is the name we
are targeting at - I see no point in inventing new names. Since we do
not yet upload I see no chance for any harm that could be done.
You see the name change is asking for trouble and --force-<anything> is
some last resort workaround we should avoid. If you want to go the
clean way for renaming a package you need to use
Conflicts: blends-dev
Provides: blends-dev
Replaces: blends-dev
just in case you might need this in other cases for the future.