I would be a bit concerned that the 1075 might be more difficult to harden without risk of cracking. It can certainly be done, but the alloy is not as forgiving as 5160. The 5160 is formulated to harden deeply but not get too hard. If is nearly perfect for leaf springs..... And what is a bow, but a leaf spring?
If you wanted to use a plain carbon alloy, I would recommend something with less carbon. I would feel better about using 1050 than 1075.
Pin-nocks or rolled-nocks are certainly easier and surer. I was hoping that you knew something about those hook-nocks, because I am pretty much in the dark about them.