This is a good outline of the counters I think. :)
In addition to the bow I would put jetpack and fire as counters to the hammer bots.
The way fire ended up working was a direct response to the tendency for hammer3s to take damage without dying due to their large body size.
So it's less of a triangle and more of a complex set of arrows where many things can be used to overcome the challenges posed by the various other weapons.
Definitely something I think about a lot though. The overhauled kick was a direct counter to the cursed mark 2 jetpack bots, who were the apex predator of Endless Mode for a while.