depending on the kind of texture you are using, you might get away with using a triplanar projection. With that you don´t have a harsh seam like you would have with a box projection, in fact, you can determine how the the seams transition into each other.
So tweaking this together with your camera angle might work for you.
There is also the possibilty to UV unwrap geometry in Keyshot. It would be best to look at a tutorial on how to do that.
However I don´t know if Triplanar and UV unwrap are pro features..
There is also the possibilty to go through a second software to unwrap your UV´s before going to KS.
i.e. Blender is a free to use software you might already know.
From your screengrab, the geometry seems fairly simple enough to easily determine the seams you need for UV unwrapping. There is also a ton of tutorials out on how to UV unwrap geometry in Blender, yet it will take a while and patience before you really know what you are doing, I can tell you from long years of experience
but it might be worth taking a look into it, if you have to do so many parts... afterwards you will be an expert !