My view would be given them any damn slot they asked for just to make it happen. Up to and including the big one.
Realistically though in terms of where they could draw a crowd in 2027 - even including a "first time back" bump I think you'd be looking at Woodsies/Park headline, or somewhere around 3rd from top on the Other stage.
Unfortunately I'm not sure that the reunion would excite many people not currently in their 40s or 50s.
Yeah I do agree on the 2 hour thing. But if they were subbed by Biffy/WA only doing 75 mins or so would be doable.
Only reason I suggested them was because we know they're back doing shows here next year.