Remover declaração de namespace da folha de estilo XSLT com XSLT

Eu tenho uma folha de estilo XSLT como o seguinte:

<?xml version="1.0" encoding="utf-8"?>
<xsl:stylesheet version="2.0"
                xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
                  xmlns:XQHeaderFunc="java:com.sonicsw.xq.service.xform.HeaderExtension"
                  xmlns:saxon="http://saxon.sf.net/">

  <saxon:script language="java" implements-prefix="XQHeaderFunc" src="java:com.sonicsw.xq.service.xform.HeaderExtension" />

  <xsl:output indent="yes" omit-xml-declaration="yes"/>

  <xsl:template match="/">
    <xsl:variable name="processId" select="XQHeaderFunc:getProperty(XQHeaderFunc:new(),'processId',-1)" />
    <xsl:value-of select="XQHeaderFunc:setProperty(XQHeaderFunc:new(),'processId',string(@id),-1)"/>

    <root>
      <xsl:apply-templates />
    </root>

  </xsl:template>

  <!-- Other stuff -->

</xsl:stylesheet>

Eu quero transformar essa folha de estilos usando uma segunda folha de estilo XSLT para remover qualquer coisa que tenha a ver com os namespaces XQHeaderFunc e saxon. Existe uma maneira de fazer isso?

Eu já tentei o seguinte, que lida com sucesso com os elementos, mas a declaração do namespace não parece querer desaparecer.

<xsl:stylesheet version="1.0"
                xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
                xmlns:XQHeaderFunc="java:com.sonicsw.xq.service.xform.HeaderExtension"
                xmlns:saxon="http://saxon.sf.net/"
                exclude-result-prefixes="XQHeaderFunc saxon">

  <xsl:param name="XQHeaderReplacement" />
  <xsl:variable name="apos">'</xsl:variable>

  <!-- Copy all nodes -->
  <xsl:template match="node()|@*">
    <xsl:copy>
      <xsl:apply-templates select="node()|@*"/>
    </xsl:copy>
  </xsl:template>

  <!-- Remove saxon script tag -->
  <xsl:template match="saxon:script" />

  <!-- Remove elements with setProperty calls -->
  <xsl:template match="*[starts-with(@select, 'XQHeaderFunc:setProperty')]" />

  <!-- Replace getProperty calls with replacement value-->
  <xsl:template match="@select[starts-with(., 'XQHeaderFunc:getProperty')]">
      <xsl:attribute name="select">
        <xsl:value-of select="concat($apos, $XQHeaderReplacement, $apos)"/>
      </xsl:attribute>
    </xsl:template>
</xsl:stylesheet>

Saída:

<?xml version="1.0" encoding="utf-8"?>
<xsl:stylesheet version="2.0" 
                xmlns:xsl="http://www.w3.org/1999/XSL/Transform" 
                xmlns:XQHeaderFunc="java:com.sonicsw.xq.service.xform.HeaderExtension" 
                xmlns:saxon="http://saxon.sf.net/">

  <xsl:output indent="yes" omit-xml-declaration="yes" />

  <xsl:template match="/">
    <xsl:variable name="processId" select="''" />


    <root>
      <xsl:apply-templates />
    </root>

  </xsl:template>

  <!-- Other stuff -->

</xsl:stylesheet>

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