This 85 km loop flies past Thrapston at 35 km and again at 60 km, so you could easily cut off the Eastern loop and save 25 km. This would mean you won't go past the Kings Head in Wadenhoe, but leaves Thrapston itself or Geddington as potential watering holes.
Here's a link to the Strava route.
Here are some routes that we regularly use for club runs. Use the Categories to limit the routes you see. The compass points relate to where the ride goes from the clubhouse. Routes can be downloaded for your cycle computer, either directly as a GPX or via Strava for TCX.