Remove xml namespace prefixes before flattening

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I'd like to remove all XML namespace prefixes so that I don't have to reference them in my processors. However the field renamer wants me to flatten the XML first, which would require me to reference the namespaces, defeating the purpose. Can I generically (using a regular expression) remove xml namespace prefixes from the entire nested field structure of the xml data?

Here's some raw xml...

<ODM ODMVersion="1.3" FileType="Snapshot" FileOID="ad998378" CreationDateTime="2016-06-03T14:59:52" xmlns="http://www.cdisc.org/ns/odm/v1.3" >
    <AdminData studyOID="mystudyoid">
        <User OID="someid" UserType="Other">
            <LoginName>somelogin</LoginName>
            <DisplayName>Tracy R</DisplayName>
            <FullName>Tracy  R</FullName>
            <FirstName>Tracy</FirstName>
            <LastName>R</LastName>
            <Address>xyz</Address>
            <Email>t.r@company.com</Email>
            <Fax>999-999-0000</Fax>
            <Phone>999-999-4011</Phone>
            <LocationRef LocationOID="10001" />
        </User>
    </AdminData>
</ODM>

What I want is for that raw XML to be parsed and for the field names to look like this...

/ODM/AdminData/User/OID..... etc.

By default it looks something like below...

/ns1:ODM/ns1:AdminData/.... etc

I don't want those namespaces in the field names, and more importantly, I dont want to have to reference them, even in the removal process. Because "ns1" is something streamsets is adding, for all I know that hard-coded string could change in the next streamsets version to "NSONE", and I can't build a pipeline with a dependency on a random hard-coded string.

So I want them removed generically. I wouldn't mind writing a regex, however that means I need to flatten the structure first, and I can't do that. I need this removal to happen while the data is still hierarchical.

FWIW - "Not possible" is a valid answer to this question.