> […] with just GParted, AbiWord, Gnumeric from GNOME w/o Qt alternatives.
You might want to look into Calligra, which is a libre Qt office suite. https://www.calligra.org/For a GParted alternative, I found KDE Partition Manager. Not sure if you're interested in KDE apps, though, since your setup seems fairly lightweight.
https://www.kde.org/applications/system/kdepartitionmanager
