Has anyone embedded C# code in a SharePoint Content Query XSL?

See more:

C#

SharePoint

XSL

Has any ever tried calling an embedded C# function from within content query XSL?

Contrived example:

<msxsl:script language="C#" implements-prefix="user">
<![CDATA[
public string yoGabba(string aThing){
  return aThing + " gabba";
}
]]>
</msxsl:script>

<xsl:template name="EmbedExample_FAIL" match="Row[@Style='EmbedExample_FAIL']" mode="itemstyle">
  <xsl:value-of select="user:yoGabba(@Title)"/>
</xsl:template>

The exception in the SharePoint log is:

System.Xml.Xsl.XslTransformException: Execution of scripts was prohibited. Use the XsltSettings.EnableScript property to enable it.

Given that I only have "control" of the XSL and not the underlying code for the web part, am I simply out of luck or is there some way?