That's a bit harder... I could make it so the paste can stack to like 50,000 (50k).
To do that I'd need to hook the on_punch callback (maybe after so many punches the node disapears, from being eaten away, possibly cause the node to shrink in height from a full block height decreasing as we get closer to the disapear time, of course I'd like it to reverse the process after a period of time to keep it renewable)
I guess I could make the nutra block more nutritious. (kind of makes it less of it's origins though, in Rimworld Nutra paste was more of a emergency supply of food, you know like a can of dog food, but for humans to eat, in my attempt to recreate the concept I made it so it wasn't very filling on the hunger bar as the goal was it could keep you alive but wasn't really ment to be a all out food source all the time)
I'll make the Nutra block provide more on the hunger bar, but I might make it require a series of nutra pastes to be crafted. (I'm thinking the total cost will be around 17 nutra paste per nutra block, basicly craft 9 nutra paste together to get a nutra paste core then put that in the middle and put 8 nutra paste around that to get your nutra block)
Oh and sorry, I'm not a graphic artist so I'll be reusing my own images/textures just slightly modified. (And sorry for the delay in this, ment to add this in but just never got to it)
Anyway your requested implementation I think is complete, just need to push a new version onto ContentDB here and just update your version.
Some catchs I've found so far, once the Nutra block is placed it can't be picked back up, so only place it down if you need the food, or just simply punch with it in your hand instead. (I haven't tested eating it while in my hand but it should work as described)
To buff the offset of 3.5 breads on the hunger bar I've made it only a little expensive (yeah 17 nutra paste meals, or about 3-4 cycles of producing nutra paste from the machine)
Oh and I've increased the stack size of the Nutra Paste from the normal 99 to 1000 (almost 10 times bigger)