Nothing will smother the honeysuckle. About the only thing that seems to work on japanese honeysuckle is herbicide. You will probably need some follow up treatments here and there.

If you planted fruit trees, that means you're able to climb up and down the slope? My local gardening center recommended honeysuckle because the roots run deep and holds the soil together. Which may be why you have honeysuckle growing there?

But my slope is very steep. It's also about 25' tall but at a 45 degree angle. It's not easy getting up and down our slope. So I planted honeysuckle and more juniper in the bare spots because I don't want to be trimming, deadheading, or picking fruit there. But I do want something to hold the soil together.

Whats wrong with honeysuckle? It smells wonderful! But I like privets too, so what do I know?