I'm a fan of bindings with straps (and closed toe... i know not what your looking for)
i love the fact that slingshots straps are replaceable, but if someone wanted to they could make any brand's velcro strap boots replaceable by sewing in another metal D ring with the existing strap material...
I have not tried many boots on, especially in real-time wakeboarding scenarios, but i will try to offer suggestions despite.
if possible, try Ronix open toe boots. the feet-belt system that they have on their boots i think works great for heel lift.
CWB boots with the hinge tech seems to work well with holding the heel down too in my past little experience