Any way to make it drop 100% random items?

[greedycooler]

I want to customize the tumbleweeds to drop random items (including items from mods), not only the items I put in.
Might make a modpack with it, it seems like a really fun idea.

[konwboj]

I already did something like this in my old mod and the problem was with the difficulty of excluding technical blocks/items which one shouldn't be able to obtain in survival. If you have any ideas how to implement it or know of any mod which does something like this, let me know.