Unless you have way flexy or lowrider boot cuffs, it seems that you'd be limited to indy, mellon, method, mute, or tail grabs in hard boots (all w/o much tweak). Also Tindy and Tailfish, but the style police would be fast on your case.
When he was doing 'iguana' airs, Damian Sanders was riding in fairly soft Koflachs. I don't know if you could get that grab if you were riding in a pair of high end hard boots.
Like the pic of the rails slide; it definitely give me something to shoot for in addition to 50-50s.