Stefan

<blockquote>
important: You can use this “plugin” even if you are not allowed to install plugins. To run this RSS FEEDER, its not neccessary to activate it.
</blockquote>
You only have to place the swf-file on a server (free-hosting..) and edit the embed-Tag. Finished! 
With the proxy-feature, you are allowed, to feed your RSS-Stream from anywhere. (Myspace etc.)
You also can get your RSS-Feed from free hosts wordpress.com blogs. (without upload or edit the template files or stuff like that.) 
You dont have to place a crossdomain.xml (thats useful, because in some cases thats not possible: if you dont have enough permissions.. etc) on your Server! (you can, if you want to disable the proxy-function. But you dont have to! 🙂 )

RSS FEED anywhere

> important: You can use this "plugin" even if you are not allowed to install plugins. To run this RSS FEEDER, its not neccessary to acti …

Greg - SiteOrigin

I built this plugin to help ease the transition during a DNS changeover, but you can use it any way you please. It turns your WordPress installation into a very simple proxy server. It fetches content from another URL, caches it and displays it. Requests are cached for 24 hours.
Install the plugin, then head over to Settings > Simple Proxy in your WordPress admin. Enter the URL you want to proxy to and when you’re ready to go, also check the enabled checkbox.
You need to have <a href="https://codex.wordpress.org/Using_Permalinks#Choosing_your_permalink_structure" rel="nofollow ugc">pretty permalinks</a> enabled.
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Simple Proxy

Turns your WordPress installation into a simple caching proxy.

RSS FEED anywhere vs Simple Proxy