Hi Splint,
Maybe all you & your wife need are cushioned arthritic shoe inserts, like what Walmart sells:

https://www.walmart.com/ip/Wormwood-Insoles-Foot-Acupressure-Insole-Men-Women-Soft-Sports-Cushion-Inserts-Sweat-absorbing-Deodorant-Massage-Insole-ShoePads-green-upgrade-43-44/6889918048

I've never used these, but they look pretty soft on the feet and have an arch support.