What I noticed about that method is that beyond not requiring a Steam API key, it also returns some fairly simply XML that might be easy to handle in-plugin.
For example, mine:
http://steamcommunity.com/profiles/7...60266039?xml=1
Returns a bunch of XML, which starts with this:
Code:
<profile>
<steamID64>76561197960266039</steamID64>
<steamID>
<![CDATA[ Weasel ]]>
</steamID>
You could just ignore everything before (and including) "<steamID>", and after (and including) "</steamID>".
That will net "<![CDATA[ Weasel ]]>" - from which maybe you can then rip-off the front-end and back-end delimiters.
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