Interesting idea! Reminds me of a community Dwarf Fortress game where each player would play one year and then pass the save file on to the next.
It could work on Discord, but it might also work with a forum thread if the save can be attached to a message. When posting it could state "Steve's turn, please respond by 2025-07-11 23:59 UTC. If no response, Bill will take the turn before 2025-07-12 23:59 UTC".
A Discord bot could help manage/exchange files and ping users when it's their turn. That might help with visibility through push notifications rather than needing to check the forum.
Why not try with a short scenario to see if the planned procedures would work? 8 or so turns with 2 days maximum per turn.
_________________
Sous-Lieutenant Steve Simenic
1ère Compagnie du 8ème Régiment d'Artillerie à Pied,
Artillerie Divisionnaire,
1ère Division,
I Corps d'Armée.
Games owned: All except Jena-Auerstedt and Napoleon's Russian Campaign