You are assuming he has to grab the edge when he scrooges. He doesn't have to do so on Smashville, and he certainly doesn't have to on Norfair. He can do what he usually does on Smashville. Go to the platform, or go back onstage if they are on the platform. OR Shark them as they are on the platform and then either continue the pressure or go to safety.
Now, even if you put a scrooging rule on him, he has some blurry line stuff that would need to be addressed. What line is established/where, how many times, and what not. After all of that, you might have some still pretty gay stuff like hanging out near the center of the bottom platform after gliding down, and from there picking some safe onstage or delayed edge grab options. Even then, a limit of 40 would probably be too high. Something like 30ish and a scrooging rule could stop most of that probably. Now just hope that onstage running from people or getting under them and sharking isn't too strong or dull either, or else all hope is lost lol.
Now, even if you put a scrooging rule on him, he has some blurry line stuff that would need to be addressed. What line is established/where, how many times, and what not. After all of that, you might have some still pretty gay stuff like hanging out near the center of the bottom platform after gliding down, and from there picking some safe onstage or delayed edge grab options. Even then, a limit of 40 would probably be too high. Something like 30ish and a scrooging rule could stop most of that probably. Now just hope that onstage running from people or getting under them and sharking isn't too strong or dull either, or else all hope is lost lol.