Ah yeah, suppose.
I dread to think what the SA front row would do to him, though. And he'd end up getting red carded by the end of the first half for punching someone.
Doran-Jones would be a much better option, and could cover 3 from the pitch as well, with Marler on the bench.
If Rowntree reckons Marler's fixed his scrummaging problems, and he's been going a lot better recently, I've no real issues with him being out there.