Untitled Sibling-Centric Epic Adventure... Yea or Nay?

Hey all!

I've been stewing on an idea for the last few days on an adventure epic that goes a little beyond the typical adventure. 

Here is the elevator pitch: 

The characters all play siblings who, at a young age, lost one of their own. Reuniting twenty years later, they must uncover the mystery of what happened to their sibling and resolve their grief.

It's a very "Mike Flannagan" (Haunting of Hill House, Haunting of Bly Manor, Midnight Mass) plot with folk horror and adventuring tossed in. And yeah, it'll definitely pull a bit from Stephen King's It.

Here's how this book will work:

• 1)  It will still very much be Fifth Edition, but the character creation element will be somewhat different—Players make their characters as they go.
• 2) The players start with the young versions of their characters, with very limited stats (basically commoners with one or two good stats). Basically, they get to play out their childhood selves.
• 3) The story begins when the siblings gather for Coward's Night" where they must all spend the night in an old elven fortress-tomb. 
• 4) We learn more about the people who the characters will eventually become by their early actions, essentially performing character creation as a narrative function versus just a bunch of dice rolls.
• 5) During Coward's Night, one of the siblings dies mysteriously. 
• 6) Flash-forward twenty years later. Using tables and a "year zero" backstory-building session, the players determined what's happened to their kids since the incident on Coward's Night. 
• 7) The siblings come together in the same place, drawn by dreams of their lost sibling. 
• 8) A series of events leads them to return to the elven fortress-tomb where they lost their sibling. They finally get a chance to learn what happened and resolve their emotions surrounding the event.

Let me know if this is something you're all interested in seeing. If so, I'll probably make it into a Patron book for next month and have it released on the site. I'll release the sections individually, probably with the initial "incident" scene first, the character-building rules, a series of sandbox adventures for the characters to perform, and then the final confrontation at the elven fortress.

I'll try to release the first bit this month and then finish the rest next month.