Creating a new menu window (concept)

Good morning all! I hope you're having a good quarantine!

I have a crazy idea. Maybe it's a pipe dream, but I need to ask. The Brave New World hack has a really cool menu that combines Equip and Relic into the same window. This created an additional slot on the main menu which the designer (GrayShadows) chose to put "Review"; a shortcut to an already existing menu function. It occurs to me that this freed-up menu option could instead be used for an entirely brand new window. 

I've been watching someone blind-play FF6 on Twitch, and after a few days off from streaming they would sometimes forget where they were and what they were supposed to do next. I thought it might be useful to add a menu called "Quest" that would show a brief description on your next objective. As you play through the game and turn on various event bits, those bits could also simultaneously trigger what shows up in the window.

This could alternately be used in an original hack (like the one I'm toying around with making) for side-quests. You could talk to a person in town who would ask you to collect a McGuffin from the McGuffin cave, and that NPC chat would trigger an event bit to show the request in the Quest window. Completing it could trigger it back off and make it disappear again.

Looking through the $C3 disassembly, it seems like it would be a **ton** of work. Technically speaking though, could it be done?