definitely a bidet. They make models that even dry. Check on Amazon for some of the various models. Most are pretty simple to install, I believe. They can tap into the lines for a bathroom sink, even, if necessary.
My Toto Washlet (Jasmine) works while I'm hoisted above rather than seated on it. I've got several inches of clearance. Phil now knows how to make quick changes with the sprayers. We do this rather than lower me due to having too many hits on my tailbone. The bidet sensor amazes me. Hanging without trying to sit upright is very helpful, as well.