Well I think if you edited your category xmls you could force it to show up anywhere. So you could make a custom pkg, that patches the category_network.xml as it installs. The only difference would be that you would have to reboot after install, or reload the XMB by entering and exiting remote play, then it will show up on the XMB.
You would need to try with this query added to the category_network.xml, edit the XXXXXXXX to suit the content ID of your pkg. Use the original package that works in the TV category, not the one edited to CB.
I have never tried this with this type of pkg, so maybe it will not work so easily.
Code:
<Query class="type:x-xmb/folder-pixmap"
key="XXXXXXXXX"
src="xcb://localhost/query?sort=+Game:Common.titleForSort&cond=Ae+Game:Game.titleId XXXXXXXXX"
/>