I don't think you'll be able to just remove the oven. It is made as a unit with the cooktop.
When you are out for several months at a time dishes, silverware and pans do get greasy. Year before last I utilized the cabinet below the cooktop by removing the doors and shelf on our 2007 HR Endeavor. I tapped into the microwave circuit for 110V thinking I wouldn't every use the microwave and dishwasher at the same time. Water hookup was simple. The drain line was a bear trying to find a place for tap in. I finally snaked in around to a grey water clean out under the sink. Install required some wood working but not a lot.
It was really nice to have clean dishes, etc.