Have you considered Tai Chi? “The Harvard Medical School Guide to Tai Chi” by Peter Wayne says at p 113 that “sensory alertness in the feet decreases by ... 75% by age 80. This sensory loss is associated with ... peripheral neuropathy due to diabetes.” And on p 118 it says “studies show that Tai Chi positively affects people who have PN and experience little sensation in their hands and feet ... [which] greatly affects balance.” It also says that a study at LSU showed that 24 weeks of Tai Chi classes by people with plantar PN due to diabetes “led to an increase in sensitivity of the soles of the feet, greater balance, and faster walking speed. Another ... trial reported that a 12 week Tai Chi program in diabetic patients with PN increased nerve conduction velocities.”