At "Hints" the policy says: "There is no need to have a binary package
that matches the source package name. In fact, you should avoid
renaming the source package for different versions as we prefer to
only have a single package version in the source repository."
Thinking about this, isn't better to rename the source package?
a) Renaming the package allows to have multiple versions in the source
repository... but you are still free to have only one, whatever the
name is.
b) There isn't too much flexibility at naming the debug packages, the
name always is