Plugin capabilities

Hi all,

Here is what I am trying to acheive : Get a XML (custom) feed containing the post that have a specific tag of meta key.

I did a custom template page looping through all posts with tag/meta_key and outputting the post as XML. Then I created a blank page that uses my new custom template page. Then, when accessing the page, I get my custom XML feed.

Drawback of this : the page is public, and appears in right hand side of the main blog page + installation of this on another worpress blog means creating the template file, paste code, create page using template…

Therefore, I would like to do this using a plugin.
Ideally, the plugin would “create a URL” that would output the XML custom feed.

Do you have any ideas ?

Constraint : the targetted blog is using a redirect to use a single feedburner URL for any ?feed=XXX request.

Thanks in advance,

Mat