Does env SAL_USE_VCLPLUGIN=gtk3 GTK_THEME=Breeze libreoffice work?
Edit: probably not, it looks like the Breeze GTK theme uses the system color scheme. You would probably need to find a breeze-like GTK theme (e.g. https://store.kde.org/p/1197982, though it’s very old and I don’t know if that’s an issue, or maybe https://www.pling.com/p/1354412/) or kvantum theme (e.g. https://aur.archlinux.org/packages/kvantum-theme-breeze-git, to use with env QT_STYLE_OVERRIDE=kvantum libreoffice).