Try some ECMAScript to configure the desktop.

roles/lmn_kde/files/fvs-config.js

@@ -0,0 +1,110 @@
+// configure plasma defaults
+
+function forEachWidgetInContainmentList(containmentList, callback) {
+    for (var containmentIndex = 0; containmentIndex < containmentList.length; containmentIndex++) {
+        var containment = containmentList[containmentIndex];
+
+        var widgets = containment.widgets();
+        for (var widgetIndex = 0; widgetIndex < widgets.length; widgetIndex++) {
+            var widget = widgets[widgetIndex];
+            callback(widget, containment);
+            if (widget.type === "org.kde.plasma.systemtray") {
+                systemtrayId = widget.readConfig("SystrayContainmentId");
+                if (systemtrayId) {
+                    forEachWidgetInContainmentList([desktopById(systemtrayId)], callback)
+                }
+            }
+        }
+    }
+}
+
+function forEachWidget(callback) {
+    forEachWidgetInContainmentList(desktops(), callback);
+    forEachWidgetInContainmentList(panels(), callback);
+}
+
+function forEachWidgetByType(type, callback) {
+    forEachWidget(function(widget, containment) {
+        if (widget.type == type) {
+            callback(widget, containment);
+        }
+    });
+}
+
+function widgetSetProperty(args) {
+    if (!(args.widgetType && args.configGroup && args.configKey)) {
+        return;
+    }
+
+    forEachWidgetByType(args.widgetType, function(widget){
+        widget.currentConfigGroup = [args.configGroup];
+/*
+        //--- Delete when done debugging
+        const oldValue = widget.readConfig(args.configKey);
+        print("" + widget.type + " (id: " + widget.id + "):");
+        print("\t[" + args.configGroup + "] " + args.configKey + ": " +
+	      oldValue + " => " + args.configValue + "\n");
+        //--- End Debug
+*/
+        widget.writeConfig(args.configKey, args.configValue);
+    });
+}
+
+// configure task bar starters:
+widgetSetProperty({
+    widgetType: "org.kde.plasma.icontasks",
+    configGroup: "General",
+    configKey: "launchers",
+    configValue: [
+	"applications:systemsettings.desktop",
+	"preferred://browser",
+	"applications:thunderbird.desktop",
+	"applications:libreoffice-startcenter.desktop",
+	"preferred://filemanager"
+	//"applications:org.kde.konsole.desktop",
+	//"applications:org.kde.discover.desktop"
+    ],
+
+});
+
+// kickoff is the default menu:
+/* this does not work (anymore?)
+widgetSetProperty({
+    widgetType: "org.kde.plasma.kickoff",
+    configGroup: "General",
+    configKey: "favorites",
+    configValue: ["applications:libreoffice-startcenter.desktop",],
+});
+*/
+
+widgetSetProperty({
+    widgetType: "org.kde.plasma.kickoff",
+    configGroup: "General",
+    configKey: "systemFavorites",
+    configValue: ["reboot", "shutdown", "logout"],
+});
+
+
+// prepare a folder view on the desktop:
+var allDesktops = desktops();
+for (var desktopIndex = 0; desktopIndex < allDesktops.length; desktopIndex++) {
+    var d = allDesktops[desktopIndex];
+    d.addWidget("org.kde.plasma.folder", 50, 50, 456, 600)
+    print("Folder app generated!\n")
+}
+
+widgetSetProperty({
+    widgetType: "org.kde.plasma.folder",
+    configGroup: "General",
+    configKey: "url",
+    configValue: "/lmn/media/",
+});
+
+widgetSetProperty({
+    widgetType: "org.kde.plasma.folder",
+    configGroup: "General",
+    configKey: "labelMode",
+    configValue: "0",
+});
+
+// /usr/share/plasma/shells/org.kde.plasma.desktop/contents/updates/fvs-config.js

roles/lmn_kde/tasks/main.yml

@@ -194,6 +194,12 @@
     dest: /usr/local/bin/
     mode: 0755
 
+- name: Copy fvs-config.js to configure plasma
+  ansible.builtin.copy:
+    src: fvs-config.js
+    dest: /usr/share/plasma/shells/org.kde.plasma.desktop/contents/updates/fvs-config.js
+    mode: 0644
+
 ################# general settings ##################
 - name: Protect grub menu entries
   blockinfile:
@@ -211,7 +217,7 @@
     firstmatch: true
   notify: Run update-grub
 
-- name: grub timeout
+- name: Grub timeout
   lineinfile:
     dest: /etc/default/grub
     regexp: '^(GRUB_TIMEOUT=).*'
@@ -219,7 +225,7 @@
     backrefs: yes
   notify: Run update-grub
 
-- name: keyboard compose key
+- name: Keyboard compose key
   lineinfile:
     dest: /etc/default/keyboard
     regexp: '^(XKBOPTIONS=).*'