Agree re. SPD cleats - much easier to walk around in off the bike and some of them can look like ‘normal’ trainers. Have you thought about double sided pedals? Essentially one side is flat, the other cleated - I run this type of pedal on two of my bikes - best of both worlds, flats when I’m just nipping about & clipped in for longer rides/commuting. They’re a bit of an investment -£30 or so for the pedals then the price of the shoes, which if you shop around shouldn’t be unreasonable (I got a decent pair of Shimano in an Evans sale).