There's also the option of just getting the backports through stable/stein ready to push at the same time an OSSN is published, and let any interested parties backport to older branches afterward. If you do mention EM branch commits, the way the VMT usually phrases it is along the lines of, "the stable/rocky branch is under extended maintenance and will receive no new point releases, but a patch for it is provided as a courtesy."
There's also the option of just getting the backports through stable/stein ready to push at the same time an OSSN is published, and let any interested parties backport to older branches afterward. If you do mention EM branch commits, the way the VMT usually phrases it is along the lines of, "the stable/rocky branch is under extended maintenance and will receive no new point releases, but a patch for it is provided as a courtesy."