Use this as a "share" URL in Feedbin and it'll inject an iframe with Instapaper's formatted version of the page inline.

feedbin-instapaper-text.js

javascript:(function(url) {feedbin_instaframe=document.createElement('iframe');feedbin_instaframe.src="http://www.instapaper.com/text?u="+url;feedbin_instaframe.style.width="100%";feedbin_instaframe.style.height="100%";feedbin_instaframe.style.border="1px solid #cacaca";feedbin_content_object=document.querySelector("div[data-behavior='entry_content_wrap']");feedbin_content_object.parentNode.appendChild(feedbin_instaframe);feedbin_content_object.style.display="none";}("${url}"));