What a great tip. It’s only when you try to use a loo with very little flowing water that you realise what a mess you can make when you go to the loo. Using a cassette toilet for anything other than a wee is quite offputting for that very reason. That’s why I use dry land facilities as much as possible for the serious stuff.
What you suggest makes absolute sense. I can’t wait to try it. I’m going to have an extra helping of stew for my dinner tonight, purely for research pusposes!