Changing Menu Order on Collapsed Navbar in Bootstrap 3

I ran into a similar issue but have been using Bootstrap 4.4 and this can be solved with a simple d-none d-block solution.

<ul class="nav justify-content-center">
      <li class="nav-item d-sm-none d-md-block">
        <a class="nav-link" href="#">Item 1</a>
      </li>
      <li class="nav-item d-sm-none d-md-block">
        <a class="nav-link" href="#">Item 2</a>
      </li>
      <li>
      <li class="nav-item">
        <a class="nav-link" href="#">Item 3</a>
      </li>
      <li class="nav-item">
        <a class="nav-link" href="#">Item 4</a>
      </li>
      <li class="nav-item d-none d-sm-block d-md-none">
        <a class="nav-link" href="#">Item 1</a>
      </li>
      <li class="nav-item d-none d-sm-block d-md-none">
        <a class="nav-link" href="#">Item 2</a>
      </li>
    </ul>

Using this method allows for items 1 and 2 to only appear after the display is set to small and below. While also hiding the originals at that same display size.

I ended up finding a simpler solution for the reformatting and reordering of the button links on the collapsed navbar, one that doesn't require new javascript code:

        <div class="collapse navbar-collapse navHeaderCollapse">
            <ul class="nav navbar-nav navbar-right hidden-xs">
                <li><a href="#" class="btn navbar-btn" id="Btn_1">Button One</a></li>
                <li><a href="#" class="btn navbar-btn" id="Btn_2">Button Two</a></li>
            </ul>
            <ul class="nav navbar-nav navbar-right">
                <li><a href="#">Item1</a></li>
                <li><a href="#">Item2</a></li>
                <li><a href="#">Item3</a></li>
                <li><a href="#">Item4</a></li>
            </ul>
            <ul class="nav navbar-nav visible-xs">
                <li><a href="#" >Button One</a></li>
                <li><a href="#" >Button Two</a></li>
            </ul>
        </div>

I simply duplicated the Button One and Button Two <ul> section and added it to the bottom. I then removed the classes and ID on the <a> links so that no button formatting would occur. Finally, I added the hidden-xs bootstrap class to the top <ul> and visible-xs to the bottom <ul> class. That did the trick: