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Wrt qt5ct: that application was only necessary during the transitory time after Qt5 was released before desktops were updated to build on top of the new version of the framework. It merely provided a way to configure the Qt5 theme. Nowadays both KDE and LXQT (and other qt-based desktops) have built-in support for managing the themes of Qt (4 and 5) applications. Thus there should be no need to apply all of those workarounds to use qt5ct, unless you are using something other than these desktops.
Additionally, KDE's System Settings has a module for configuring the Gtk (2 and 3) theme settings.

and how is this relevant to this forum? Or actually a Brainstorm?