Using an XSLT to merge two XMLs then apply itself (or another XSL) to th

I have what I consider to be a major head-ache and I have searched (google) 
high-up and low-down. I now realise, I don't really understand XSL all that 
well.
The problem:

        myprocess.transform ( xsl-a, xml-f );

I need to have an XSL (xsl-a) take the supplied xml file (xml-f) and stick 
it into a specific node that resides in an external XML document (xml-e), 
take the combined xml DOM (xml-c) and process it with a final xsl (xsl-b) to 
produce the required output.
How:

I am confused and dis-orientated.

While currently programmed in C# under .NET 2.0, this XSL and XML will need 
to be processed under Java using Xalan as well - so I need a plain-vanilla 
solution. I would prefer not to perform two seperate XSLTs in the code for 
this special case only.
xml-f:
<?xml version="1.0" encoding="UTF-8"?>
<support>
        <first-name>Mickey</first-name>
        <last-name>Mouse</last-name>
        <user-name>mmouse</user-name>
        <password/>
        <email>mickey(_at_)disney(_dot_)com</email>
        <network-status>ACTIVE</network-status>
</support>

xml-e
<?xml version="1.0" encoding="UTF-8"?>
<root-node>
        <random-nodes>
                <instance>
                        <!-- Each of the child nodes of xml-f:<support> need to 
be inserted here
-->
                </instance>
        </random-nodes>
        <other-random-nodes>
        </other-random-nodes>
</root-node>


xml-c: Should look like this:
<?xml version="1.0" encoding="UTF-8"?>
<root-node>
        <random-nodes>
                <instance>
                        <first-name>Mickey</first-name>
                        <last-name>Mouse</last-name>
                        <user-name>mmouse</user-name>
                        <password/>
                        <email>mickey(_at_)disney(_dot_)com</email>
                        <network-status>ACTIVE</network-status>
                </instance>
        </random-nodes>
        <other-random-nodes>
        </other-random-nodes>
</root-node>

** Then I need to process this combined xml-c DOM using another XSL (xsl-b).
**

Thanks in advance for any help you may give.

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