I'd like to change the layout used by some of the default Odoo's report templates. So for example, the next code could be the first lines of the Stock Picking report:
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<?xml version="1.0" encoding="utf-8" ?>

<odoo>
    <data>
        <template id="report_picking">
            <t t-call="web.html_container">
                <t t-foreach="docs" t-as="o">
                    <t t-call="web.external_layout">

But I'd like to change the t-call to 

<t t-call="web.internal_layout">

But if do so, I will have to copy all the content of the template inside my new t-call="web.internal_layout" ...

What I've currently done, is this here:

<?xml version="1.0" encoding="utf-8" ?>

<odoo>
    <data>
        <template id="stock.report_picking">
            <t t-call="web.html_container">
                <t t-foreach="docs" t-as="o">
                    <t t-call="web.internal_layout">

Overriding the original template, but this approach doesn't look a really solution, so I'm not following the inheritance flow (inherit_id), and here below is what I'd like hypothetically to do, but seems to be imposible to reach and alter the t t-call tag:

<?xml version="1.0" encoding="utf-8" ?>

<odoo>
    <data>
        <template id="my_new_picking_template" inherit_id="stock.report_picking">
            <xpath expr="//t/t/t" position="attributes">
                <attribute name="t-call">web.internal_layout</attribute>
            </xpath>

Is something like this or something similar possible? :)

​