I tried the MKS Lambdas (Riv GripKings) - too long, and my shoes wouldn’t stay stuck on them, especially when wet.
Then moved on to the VO Sabots (oh SO pretty). My shoes stuck much better, but my feet still hurt. I had been riding with Five Ten shoes, and decided they were too flexy, so I reattached the cleat mount cover to my PI X Alp shoes, which I’d bought a few years back, and promptly shelved because hotfoot. That helped. Some.
Then I watched a review of the iSSi Thump pedals from the Path Less Pedaled folk. The “concave” design caught my attention - less pressure on the part my feet which suffer from hotfoot. Bought a pair, size small.
Went for a 100km ride. It was a very hot day. My shoes did not slide. My feet did not hurt.
Winner. They’ll be promoted to the usual long ride bike for further review.