Makes sense. How about calling it Replacement. 0 or 1?
Replacement (optional)
::::::::::::::::::::::
Indicates that this project is no longer being developed. The named
project provides a drop-in replacement.
A version declaration may be supplied and must follow the rules described
in `Version Specifiers`_.
The most common use of this field will be in case a project name changes.
Examples::
Name: BadName
Replacement: AcceptableName
Replacement: AcceptableName (>=4.0.0)