I wonder if there is a way to do this with a regular composting toilet. The type that has a separate pee compartment in the bowl to separate liquids from "dry" material. I'd imagine it's quite hard to aim during the washing process and getting the solids wet defeats the purpose of a composting toilet.

I love my bidet and usually carry a travel bidet. For campervan camping I looked at composting toilets but this one problem has ruled them out for me so far.