At the current state we can use allergics with ugly crier and vomit traits to lock them with buddybuds. The stress would skyrocket and then they would produce resource for us. Just for god sake feed them something dont be a complete monster! But chose anything quality 0 or bellow. " gourmet allergic combo".
Pretty easy to get Pips to do what you want, from what I can see, though I will admit it does use some space. It looks like they plant anywhere there's exposed cultivatable soil, you just need to dig a natural path for them with that in mind (keep dirt as the top layer and they'll eventually plant on it). Using the material overlay helps a lot with this. Then put a storage bin with whatever seeds you want them to use on the other side of a door leading to the space, and viola!