Cannondale Topstone?
https://www.cannondale.com/en/USA/Bi...ntid=undefined
$1000 gets you Sora with mechanical disc brakes, but I'd really try to stretch and get the 105 version at $1650. It's a big jump but drive train is just way better, plus you get hydraulic disc brakes instead of mechanical.
Huge tire clearance, mounts for racks/panniers/3 bottles, etc.
Seems like an ideal gravel bike to me.