Have you tried washi tape? Some designs are so adorable using is as accent parts would make the cane unique, some washi tapes are semi transparent.
I bring on to cane handle plushie material because gum or other one causes painful blisters it's always colorful. No problem with insurance just because my cane looks bit different (with way different handle material and colors, shiny stones and jewelry key charms yes I'm adult but often somebody else was taking my cane so i had to make it as different as possible) , was often taken by ambulance found on the street or sidewalk because of my other medical condition. As long proper technique is used while walking with cane insurance is valid at least in Europe that's most important or having the yellow armband with 3 black dots - symbol of severe visual problems visible.
$1$1This looks interesting special designed removable decorative tape for medical aids
$1 they claim it can be reapplied and desinfected leaves no glue