Default TinyMCE 5 icons? Adding | separator?

Hi!

I’m working with this plugin to be able to add and reorder buttons in the toolbar. But i can’t make it look the way i want… I want to be able to use the default TinyMCE 5 icons, and add line | separators between some buttons. How do i do that?

Basicly, i want to be able to use this configuration with the default TinyMCE 5 “theme”:

tinymce.init({
	plugins: "a11ychecker, autosave, tinycomments, directionality, link, linkchecker, powerpaste, preview, searchreplace, toc, table, wordcount, code, lists",
	tinycomments_mode: 'embedded',
	tinycomments_author: 'USERNAME',
	toolbar: "undo redo | styleselect | bold italic strikethrough underline forecolor backcolor | alignleft aligncenter alignright alignjustify | bullist numlist outdent indent | link showcomments removeformat searchreplace preview code",
	style_formats: [
		My-style-formats-here
    ]
});

I can edit this in the plugin code also, if that is the only way to do it.