I would beware of any chiropractic practice that wants you to "sign on" for a specific amount of time. I go for chiropractic adjustments regularly. They are covered by my insurance minus my co-pay. They have never requested me to make any commitment. I just call like I would any other practicioner, when I want to get in for an appointment.
I don't think chiropractic adjustments would make a difference in your neuropathy, unless the nerve damage is coming from something in your spine. If that is the case you should know this from EMG/NCV testing.
I find the adjustments beneficial because my gait is off due to the neuropathy and it helps keep things alligned.