Custom More Dialog Possible?

Just getting started with HA and having a blast; I am trying to create a universal remote in HA. I have lirc and lirc_web up and running on my Pi, which is great, but yields virtual remotes for individual devices. I would like to do something to be more universal and able to control multiple devices for a single remote layout.

Is this achievable through the More Dialog? I’ve come across documentation on customizing the More Dialog, but not anything about out right changing it. This would be ideal, have a main switch for a TV and then the More Dialog provides a full remote.

If not, I’m sure a custom panel could achieve this, but like the idea of the More Dialog much more.

Thanks for any guidance/help.