I'm going to lay this out for you - your rifle is NOT an SS rifle. The fact that a single stamp resembles something on an SS rifle is not an indicator that your rifle is SS. Many specialized manufacturers used dies and stamps supplied by single sources, mostly larger depots, which supplied many different industry and organizations. Back then numbering dies were hand made so it wasn't like today where a small shop can turn out dies with a CNC. So all of the odd stars, cursive Sauer S stamps, other odd *&%$ looking markings are simply process stamps used by manufacturers to approve operations to the blanks, and receiver bottoms were the easiest place to stamp inspection markings. One of the Steyr process stamps look like a dude with his dick hanging down, but it isn't indicative of a thriving porn industry at Steyr.
I appreciate your thoroughness, but you are seeing things that aren't there. Yes, there are stamps, and you see a skull and some runes, but those things you see are NOT what you think they are, unless in the 70's somebody put them there for novelty purposes.
The SS did not reinvent the wheel on every rifle, the markings used are pretty easily tracked by variant. Your rifles bolt is not mismatched due to field armorers, it's mismatched because someone put it together from parts. Done during the war or after is irrelevant as official depots did not do it this way, we know this from years of research and study, just like you are doing, but on a larger scale and across the world.
My suggestion, go out and find another rifle and study that one. When you get another and compare, you start to get a clearer picture. The more you get, the more you see. But trust me, the "This is an SS rifle because.." rabbit hole is just going to irritate you and others, it isn't an SS rifle.