Is this a solution?

During the 2015 Odoo experience a presenter said it was possible to redirect old product pages to a new url by using ir.attachment.   Is this possible?

        <record id="old_url_product_6" model="ir.attachment">

            <field name="type">binary</field>

            <field name="url">/product/6</field>

            <field name="name">/shop/product/6</field>

        </record>