https://pedal-plate.cc/
iv been getting on great with these. When I’m riding stop start to the gym being on flats is much more convenient. but then come the weekend or lovely summer evening ride I’m back in clipless.
sure you can ride short distances with casual shoes ontop of spd-sl pedals but it’s not ideal and will wear the pedals in an odd way. The pedal plates also act to protect in my case very expensive pedals.