Why not go Goliath, then use a Tonfa as a weapon? I could see a Goliath using a SWAT team door ram as a huge tonfa. That way it would still be a weapon so you could get your proficiency and it would look pretty badass too.
If you see The Force Awakens, you might find some inspiration for the concept.
If you see The Force Awakens, you might find some inspiration for the concept.