I sucks, but with cmd grab being a high, and Sub having no reason to make you stand block and literally every reason imaginable to make you crouch its not going to get a ton of mileage.
I dont mean to be discouraging and dickish. We all need to think and brainstorm ways to make this work for Sub and its still damn good to know, but its going to be super dangerous to risk it outside of the uninformed who just dont know Sub.