Shake&Bake
Party Liaison
Capitalise on Walker's posthumous appearance?
But in all honesty, I don't think it would be right to cut him out of the film.
The movie would have made money with or without him anyway.
If they can get the story (using that word loosely here) going on with what he has shot so far - then why not?
The Crow had scenes where Brandon Lee where was digitally enhanced (for what it was worth back in the day anyway) after he died on set.
And I'm sure there must be other movies where this kind of thing has happened before too.