I think you are correct that this kit has value for neuroscientists.
However these debates also need to shed light on an evolutionary pathway of the nervous system.
Nerves are important for all organisms with heterotrophic food pattern - it gives them an incentive to react on a changing environment.
In the evolutionary sense our nervous system is very comparable to that of a cockroach having a ventral and dorsal nerve string with some ganglia (group of nerve cells) strewn along those strings, and one ganglion that is very intricate - the central processing unit - the brain.
Functional grouping of the nervous system:
1) Central Nervous System (CNS) bunches the inputs (afferent part of Peripheral Nervous system (PNS)) and gives output (through efferent part of PNS) to muscles
2) Autonomous input/output part of PNS helps for eg fight or flight, digestion, defecation...no CNS involved although CNS does record problems
Since pain is an input related part we do have an important clue that invertebrates can have this stimulation.