You inspired me. Here's a first, hacky, iteration to at least remove one step

    (function showMenuInterval() {
         Array.prototype.forEach.apply(document.querySelectorAll('[aria-label="Insert more menu"]'), [function(menu) { menu.style.display='none'; }]);   
         Array.prototype.forEach.apply(document.querySelectorAll('.aZ > .wL.wM'), [function (menu) { menu.classList.add('wN'); menu.classList.remove('wM'); menu.style.width = '186px'; }]);
         setTimeout(showMenuInterval, 50);
    }());