I had the same issue with syncing some Pocket articles to my Kobo Glo. What I ended up doing is creating a HTML5 document on my website, copying the article I want to read on my kobo into my document and adding noindex and nofollow in the meta. Then I went and add my new website page to Pocket. It synced right away - ready to read it on my Kobo. The code looks something like this:
<!doctype html>
<html>
<head>
<META NAME="ROBOTS" CONTENT="NOINDEX, NOFOLLOW">
<meta charset="utf-8">
<title>Original article title</title>
</head>
<body>
<article class="film_review">
<header>
<h2>some subtitle</h2>
</header>
<section class="main_review">
<p>copy of article I want to read</p>
</section>
<footer>
<p>
Posted on
<time datetime="2015-05-15 19:00">May 15</time>
by Staff.
</p>
</footer>
</article>
</body>
</html>