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My plugin cannot control your linked one, but you can try this:

In your linked plugin, replace

    const _Scene_Menu_start = Scene_Menu.prototype.start;
    Scene_Menu.prototype.start = function() {
        _Scene_Menu_start.apply(this, arguments);
        if (Window_MenuCommand._lastCommandSymbol &&
            Window_MenuCommand._lastCommandSymbol === Window_MenuCommand._lastPersonalCommandSymbol) {
            this._commandWindow.deactivate();
            this.commandPersonal();
        }
    }

with

    const _Scene_Menu_start = Scene_Menu.prototype.start;
    Scene_Menu.prototype.start = function() {
        _Scene_Menu_start.apply(this, arguments);
        if (Window_MenuCommand._lastCommandSymbol &&
            Window_MenuCommand._lastCommandSymbol === Window_MenuCommand._lastPersonalCommandSymbol &&
            $gameParty.members().length > 1
        ) {
            this._commandWindow.deactivate();
            this.commandPersonal();
        }
    }