That looks look like it's a pretty long bed so anything you try might be kinda cashy. Can you set up some sort of irrigation to make sure they get plenty of water and just hope for the best? They may look a little crisp in July and August heat, but with plenty of water they should still be okay the following spring, I would think. I lost a pine tree last fall and now it looks like the one next to it is dying, so I'm in the same boat. Mine will get sun until about 1:30, so I'm hoping I can keep them watered enough during the really hot months to keep them going. I always tell people if they want to see my hosta beds then make sure you see them before the end of June! That's when they look their best here. Once the heat and humidity set in its just watering and weeding, but they still start to look tired.
