To be honest Hurricane, I think you're the one putting trivial objections in the way of sensible ideas.
So many parents manage to clear away their children's lunches without any problems, how is it so different for you? Many of the suggestions have been very practical and sensible. My own children each take a plastic lunchbox. Inside it are 3-5 plastic containers of various shapes and sizes. Inside one goes the sandwich or other savoury element, inside another their yoghurt if they're having one, home-made muffin or whatever in another. You get the picture. It takes no doing for a child to put any leftovers or wrappings (not that wrappers should be necessary) inside one of the smaller containers, snap it shut and pop it back into the lunchbox. We have 3 and 4 year-olds at our playgroup who use a similar system and manage to deal with it all themselves, with no adult help and no resultant mess.
As to adults not doing the same, we do. If my husband or I take a packed lunch, we do bring back our apple cores or banana skins and compost them at home.
Our school actually has lots of 'green' policies and recycling initiatives - we were one of the first primary schools in the country to have a special 'rocket' accelerator composter, and that is used for apple cores etc from playtime snacks and for school meals leftovers. But I still think it is the right thing to do for children to take their stuff home at lunchtime. I'm still bewildered it can be such an issue - everyone in real life I've asked about this since the topic was first posted on Thursday has been amazed it's a problem.
I can only repeat, it takes me less than 15 minutes to make 3-4 packed lunches, and no more than 10 minutes to clear them up and wash them up at the end of the day. No mess, no angst.
If it really causes so much grief in your household, I can only suggest school dinners or coming home to lunch as a solution...