What equipment do you need to cycle around the world? In a nutshell, and without sounding flippant, the actual answer is simple. A bike, some simple repair tools and the desire to do it. You obviously ...
The Shimano M520 pedals are about as close to the default option for a gravel pedal as it's possible to get, and for good reason. They last for ages, they work well, and they cost relatively little.