Great idea but not right in this case!
"I bought these hoping to carry them when bikepacking and I wanted to wear sandals on a hot day, but my SPD pedals have a small platform anyway so these don’t fit, they seemingly only fit SPD’s with no secondary platform! Another issue is that the Inst’s recommend fully tightening the SPD adjustment before fitting, no-one’s gonna do that and then reset after using, are they?……great idea but doesn’t quite work for me! I’ll maybe try and trim the plastic and get a fit?"