I teach logsitics using factorio. As often as possible I publish tasks and solutions in my blog or on youtube, most in German sorry.
I look for mods making nonsensical behavior realistic so that students can't take advantage of it.

Belt overflow https://mods.factorio.com/mod/belt-overflow is helpful, because a belt that keeps running just throws everything on the floor.
I have learned that another idea https://www.reddit.com/r/factorio/comments/pjrxfi/request_for_a_special_belt_mod/ is not so good.
So Belt-Overflow is ok.

But any belt needs electricity, so I use https://mods.factorio.com/mod/PoweredBelts too.
Additionally I use spawn belts https://mods.factorio.com/mod/spawn-belt to create material from nothing,
sometimes it is good to be able to rescue students from hopeless situations.

But unfortunately it does not work together, very sad.

Perhaps ist´s possible to make this combination(s) work.
Also a combination-mod overflow and powered belts would be great.
I crosspost this in belt-overflow too, maybe something will come of it.