I had posted this same question a year or so ago, when i also was wondering what to do. I have very slowly progressing PN, worrisome but not life changing, yet.
I did as much research as possible, finding little in definitive answers. I asked my neurologist; he had nothing. I didn't get much from my post herein.
I had the Zostrex vaccine years ago. What with the horror stories I hear about PN in others, I'm choosing to cross fingers and live healthy, like that may work. I suspect I'll have plenty enough antibiotics and vaccines in my future to create havoc with my nervous system. Today I'll choose not to mess with this one.
Just my humble reflection.