if you ask me you can't portray "rape" as tasteful. you just can't. it can't be non violent either. it's a very serious and hurtful matter. if you present it as other than that it defeats the purpose of "rape" in your story.
maybe you can just cut the rape scene itself. just show the beginning and then after it. that way the act itself doesn't lost or isn't taken lightly. i'm sure you can do that.

edit:
i just read
this article and the female director said this about the a rape scene that maybe could be of help.
“When you’re shooting a film, it’s the images you line up next to each other that create a story,” Kampmeier said. “If you have a hand hitting the ground, Dakota screaming ’stop’ and you see a zipper unzip — that creates a rape.”