Advice Best Shoes for European Megatrip with Special Foot Needs

Hello, I'm planning a megatrip across Europe, including Normandy, Switzerland, and London. However, I've had an ankle fusion surgery and deal with both neuropathy and flat feet. I'm on the hunt for the best shoes that can handle long days of walking and exploring while providing the necessary support and comfort for my condition. Does anyone have recommendations for brands or specific models that worked well for them under similar circumstances? Any advice on what to look for in a shoe for such a trip would be incredibly helpful. Thanks in advance!