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24″ is a smaller size and very few made as you may see, it’s great for a space saver but won’t work well as like a toaster function. The KitchenAid is a very good unit in the 24″ just takes a while to heat up with Fisher Paykel prob being one of the best, but they are better off looking maybe at a speed oven? In a 24″ that would toast better as it will have the element needed Miele makes a few. The best overall option if not mounted too high, is the Sharp SMD2499 air fry, toaster, microwave all in one unit. It pulls out like a drawer so needs to be mounted at a proper height for use, but really will function more like a toaster if they seek that. https://shop.sharpusa.com/24-in-built-in-smart-convection-microwave-drawer-oven-smd2499fs/
Air Fry
Microwave
Convection
Speed Cook
Toast