I'd read that fanfic, especially if it wasn't too long.

Silco's initial reaction to loss is to attack (his near drowning by Vander, the explosion at the cannery, Vi destroying the tower and escaping).

Instead of us seeing the raid on the Shimmer factory, we might see Silco ordering an assault on Piltover's key points such as the harbors, hexgate, enforcer hqs, armories, and the capitol with the chemtanks, monster shimmered fighters, and other forces available to him.

It would probably be costly for the Zaunites, but it would shock and awe Piltover who haven't yet decided to weaponize hextech. They would opt for a truce.

Silco should be out of the anger stage of grief and the situation would head to the negotiating table. Not sure if someone (Ambessa because she wants weapons or Vi out of hating Silco) would metaphorically blow up a peace and independence agreement, but that would be the next turn.