JSFiddle - React, Tailwind, and code Playground

HTML

<div class="nav-container desktop">

<a href="_index.php?page=_sub_papa&main=klassen">One</a>

<a href="_index.php?page=_sub_papa&main=tw">Twp</a>

</div>

JavaScript

jQuery.fn.outerHTML = function() {
  return jQuery('<div />').append(this.eq(0).clone()).html();
};

$.each( $('.nav-container>a'), function(i, item){
			
			if( !$(item).hasClass('navbox') ){
				var menupunkt = '<li>' + $(item).outerHTML() + '</li>'
				console.log(i, menupunkt, item );
				$('#replacemenu').append();
			}
		});