Ok, so here it is the Middenator v1.0

This is the top level sorting platform underneath could be a second tier for which you can add more paths to sort. The limit is how high do you want to build.
Once sorted you can have containers at the bottom to gather up into top level categories, or a second sorting option. I think this is an improvement over a single pile of rubbish.

Building a full version on mountainside would be my recommendation

Some items sort well on the low angle roof, some need the higher angle (wood and flour). I have not tested with the scale roof, it might provide different properties.
Place a foot bar and aim into the skip at bottom, then chuck items out your inventory.

https://steamcommunity.com/sharedfiles/filedetails/?id=2815496296
https://steamcommunity.com/sharedfiles/filedetails/?id=2815496304
https://steamcommunity.com/sharedfiles/filedetails/?id=2815496322

Did this on live account, if you want to create a giant waste dump on a shared server would be pretty cool imo.