Combining content sources into one list

Hi, I've been attempting to make an INprogress widget combining movies and episodes without relying on an addon such as Embuary helper. I am able to create a dynamic list with both inprogress movies and episodes by having more than one <content> source in my list. But whatever the sort methods, Kodi seems to evaluate the first source first, then append the second to the end. So currently, this will show all inprogress movies sorted by lastplayed/descending, then all episodes, even if an episode is the most recently played. I'm assuming this is as good as I can get it, but does anyone know any tricks or hacks to be able to sort the two content sources together?

    <include name="Widget_InProgress">

        <include condition="System.AddonIsEnabled(script.embuary.helper)" content="Widget_Template">

            <param name="widget_position" value="$PARAM[widget_position]"/>

            <param name="widget_header" value="$LOCALIZE[31226]"/>

            <param name="id" value="$PARAM[id]"/>

            <param name="content" value="plugin://script.embuary.helper/?info=getinprogress"/>

        </include>

        <include condition="!System.AddonIsEnabled(script.embuary.helper)" content="Widget_Template">

            <param name="widget_position" value="$PARAM[widget_position]"/>

            <param name="widget_header" value="$LOCALIZE[31226]"/>

            <param name="id" value="$PARAM[id]"/>

            <param name="content_path" value="Widget_Container_Content_Path_InProgress"/>

        </include>

    </include>



    <include name="Widget_Container_Content_Path_InProgress">

        <param name="limit" default="20"/>

        <definition>

            <content target="videos" sortby="lastplayed" sortorder="descending" limit="$PARAM[limit]">special://skin/extras/playlists/inprogress_movies.xsp</content>

            <content target="videos" sortby="lastplayed" sortorder="descending" limit="$PARAM[limit]">special://skin/extras/playlists/inprogress_episodes.xsp</content>

        </definition>

    </include>