Item converter entity

Basically, the idea I have is primarily for workshifts on my server, though I'm sure it could be used for other systems. What I image is that you could have an entity similar to a salesman, where you could place in an item (let's say, an empty ration packet) and that ration packet could be converted to whatever items you set it to be able to be converted to.
So for example, the empty ration packet could be placed into the item converter entity, and in the menu it'd show up a list of items you could convert it to. In this case, different grades of rations. You click whichever item you want it converted to and the converted item is dropped in front of the converter entity.
Sort of like really simple crafting but run in an entity. I'm unsure how difficult this would be as the most experience I have with coding stuff like this is copy-pasting faction plugins and editing them. It'd be greatly appreciated if someone would make this or something similar to it.

 

This has already been done in a similar manner, the plugin is called Uber Factory: http://forums.cloudsixteen.com/threads/old-plugin-pack-from-2014-maybe-dont-work.8203/

I don't know if it still works though.

 

I have Uber Factory all fixed up for my server, and I've got it for rations, but trying to edit it for other stuff is risky as last time I tried it, it broke my game.