I thoroughly enjoy the documentation here Stephen. Thanks for your dedication to to this experience log.
Though you have mentioned how much you love the Polaski, my sympathetic back aches to watch how much bending you are doing to break through the ground with that short tool. Any possibility that you could double the handle length with a customized "found" wooden handle and save your spine? Since you wouldn't use the axe end as much as the flat grub hoe blade, maybe a
sharp iron grub hoe would help simplify the Complexity Trail. The 6" grub hoe is a lifesaver for me in clay/sand. The 4" might be more similar to the Polaski blade for tough ground.
Happy trails!