Considering the portable miner takes 1 inventory slot, and the fact that the materials to make one are much more compact, it's kinda pointless to make these in large quantities in advance.
When you need to make a miners, just plop down a Workshop (or use the one in a vehicle), and make the portable miners you need, then disassemble the workshop.
As to the inhalers. Again, kinda pointless to automate this since you can't automate obtaining the materials.