Not sure if it's been done, but if you were going to do a fakie ollie to switch fs blunt on a rail, but turned it even more into a fs crook. Also the opposite with a nollie to fs blunt but turned more to switch fs crook, so like a bs 180 switch fs crook but with a nollie. Seems super hard, but if Davis Torgerson can do the nollie fs hurricanes, I'm sure it's possible.