I bought a pair of boots by Lewis & Clark called an All Weather Moc at Sportsman's Warehouse a few years ago. They slip on over waders, ran about $20, and were all rubber lowers and a stretchy canvas upper. Also wore them pontooning as they were light, comfortable, and good protection for the pricey Simms booties coming and going to the water. Also took them to BC for floats in aluminum drift boats and use them here wading the saltwater flats. Great traction and comfort. I got a size 2 up from my street shoe, similar to sizing wading boots, and they fit over the wader booties fine.
Trouble is finding them. I Googled the name and found a reference to Sam's Clubs, a few on EBay, etc but no way to order them by size.
Try Sp Warehouse and see if they still list them on line or in stores. Or maybe you'll have better luck searching than I did.