You could try this route: ZWE-AMS-CDG-SVQ. It’s a bit trickier because there are fewer flights, but the itinerary includes two connections, which helps. I found fares around €800 for travel between October 3 and 5. That’s slightly above your budget, and you’d need two overnight stays. It adds some cost, but Seville is a great city to spend an extra day in. This was just a quick scan. Better prices might be available. After October, it gets more difficult as flight frequency to Seville drops during the winter season.