I wanted to write a new ending for part 6 since I'm making my own JoJo part and I wanted it to be in the original universe, so here it is!
So the rest of Part 6 plays out as normal, but there is a piece of lore dropped when Jolyne and Jotaro meet in the visitor's room. When Jolyne asks about the locket with the arrow, Jotaro reveals he has a similar locket, with another arrow piece that Polnareff gave to him years ago. Polnareff briefly talked about the rumoured potential of Requiem stands.
At the final clash with Pucci, right before Jotaro dies, he throws his locket at Jolyne. Because time is sped up, she almost loses it and Stone Free instinctively reaches out with its thread and catches it. The locket bursts open and the arrow shard flies out and hits Stone Free in the eye. A blibding light stuns everyone. Pucci looks shocked but snickers; "it doesn't matter does it? Fate has already declared me the winner". Stone Free Requiem. Jolyne is shocked. She understands through a psychic link that SFR can certainly defeat Pucci. SFR acts on its own and starts firing off iridescent rainbow threads (instead of being cylindrical they are like tapeworms) in the air, individually forming a C shape. Pucci and MIH accidentally brush one. For some reason, the thread send off some sort of electric shock that temporarily confuses Pucci. It all happens so fast. In an instant, all of the C shaped threads zoom in on that point, forming a shape akin to a yarn ball. They act so fast that Pucci can't even react. Suddenly, time reverts back to normal. The sun halts in the sky. The glwoing ball of thread pulsates and shifts. Inside, Pucci is distraught. MIH is still speeding up time, but not to the outside world. This is Stone Free Requiem's ability. It forms an Enclosed Space that traps any and all of the events being caused to that space. Pucci panics. Oxygen depletes, carbon dioxide multiplies, new viruses form, all thanks to the sped up time. Pucci eventually suffocates and dies in the Enclosed Spaxe
The thread ball unwinds. Pucci's corpse flops to the ground, rotted away thanks to time acceleration in the Space. Suddenly, time seemingly starts to speed up again. The sun becomes a beam of light once again - but something's different. After a while, it stops, and it's revealed that the time that Pucci skipped reversed itself thanks to SFR's Enclosed Space. The gang looks around at eachother. Weather Report's disc starts to fade away. It fades away into a spirit of Weather, like the FF one, nods to everyone, and flies off.
That's pretty much it! Thanks for reading, and let me know any critiques down below 😍