I also use a MacBook Air. If I don't do a slide show for YouTube in a video editor (so I can do panning, zooming, titling, add audio, video, and graphics), then I use a $40 (€35) program called Graphic Converter, which I've used since 1993. It is Mac ONLY, and is considered the "Swiss Army Knife" of Mac graphics tools. Here's a link to it:

https://www.lemkesoft.de/en/products/graphicconverter/

I recently put 750+ images in a folder and told Graphic Converter to present a slide show by dissolving the images at a rate of one every six seconds. This was for my 50th year high school reunion. I digitized all the good negatives from my yearbook photography in 1972-'73! It was a big hit.

Without intentionally trying to sound snarky, I offer my sympathies to you and your wife for the issues you face. It sounds like a camera is the least of your challenges. If you are seeing a good, qualified doctor for your foot problem, especially the condition you mention, they generally have a camera or good phone photo capability and may take the photos for you and share with you. Sounds like you and your wife need each other. BTW... I have been married 37 years and I would be lost without my sidekick. Best to you for a better year.