I'm not sure if I'm understanding 'walkway', because chickens make a mess of everything; it's all mixed up.
I've been very pleased with wood chips/leaves and pine needles in my open run (uncovered except for netting). I've got at least 4" in there. Poops get buried. Water drains through, so no mud.
I've kept a pile of wood chips and some bags of leaves, and have been supplementing through the winter.
Lots of bugs under there!
Here's a way to get free wood chips. Not sure if it is active in Newberg, but you might check in to it.
https://www.chipdrop.in/