Look Keo Flat pedal adapters that convert the pedals to platforms. These added a lot of function to my favourite training bike. Link in comments : r/functionalprint
Bike Pedal Adapter, Bike Shoe Cleats, Auto Platform Adapter, For Shimano Spd - Sl/look Keo Compatible Pedals | Fruugo ES
Pedal Plate Flats Adapter for Look Keo pedals - Bikable
Pedal Plate KEO – Adapters for Look KEO compatible pedals – No additional cleats needed | Pedal Plate