Are there any plans to remove webkit from a default installation?
Other distributions are already trying
They mentioned Marble and Digikam.
Marble I think it's already done a step to qtwebengine - 1 2
New Digikam6 also.
QtWebkit was in the process of being removed from the KaOS repos in 2016. Then a fork emerged and was extensively discussed in the Qt ml, and end conclusion was that this fork would eventually be merged into main Qt.
Not sure if OpenSuse ever moved to this fork (so they kept shipping unmaintained "official" version).
I know the merge has not happened yet, but this discussion is just over one year old, too soon to say if it really will happen, or it is a dead issue.
Could you may consider applying OpenSuse patches to KDE Plasma libraries and also signon-ui to switch them to use QtWebEngine instead?
Then we will have only a few remnants on QtWebkit.