Sorry to hear about the bad reaction to the Shingrix shot. My husband and I have both had the older shingles shot, and more recently, the Shingrix, with no ill effects. In checking with all our friends and aquaintances w/in our age group (70s and 80s) none have had what you experienced. I say this so your wife doesn't forgo the shot if she has no contraindications. Shingles, from what I have been told by persons who have had it, is an agonizing and painful disease, which can last for months. I fear that you are in that small percentage who suffered from side effects.
We feel it is unwise to try and skip any immunizations recommended for a particular destination. We have had our Hep A, Yellow Fever, both types of pneumonia (viral and bacterial), and of course we stay up-to-date on our T-Dap and get annual flu shots. We both received the oral polio vaccine when it came out in the 50's (as some of the first recipients). Measles, mumps and rubella vaccines came out when we were adults. We had those three illnesses when we were children, as did all our friends. We also had whooping cough. As a kid, the only vaccine any got was a smallpox vaccine. Many of my generation can still see the small circle on our arm, an artifact from another time.
Get any shots you can to protect you, especially, as others said, when you are visiting someplace far from good medical services. In Africa, at some of the game preserves we visited, it would have taken at least a day to get to a place with a hospital. And don't forget your malaria pills!
(p.s. Be glad you probably won't need cholera or plague shots. When my husband went to Viet Nam, he had those and said they really laid everyone low!)