That looks mad, but I´ve seen similar madness before. When it´s just a fracture and it´s been repaired with a titanium plate it´s possible and it´s been done before with success. But it´s extremely risky, in case of a crash the plate and screws could cause a much bigger disaster
If I was MM friend, I´d be calling him daily to stop him, he doesn´t need to assume that kind of risk, even if this season title goes away, wich I think will not even if he can´t race this weekend