I get where you're coming from. One of my pet peeves with vanilla is naming items "Raider 'X'". It's just improvised wastelander gear. The only reason it's exclusively associated with Raiders is that the devs named it as such. If anything, raiders would have far more eclectic equipment, as the stuff they're salvaging and stealing wouldn't be consistent with any particular style.
A lot of the Raider base decorations, like spikes, burning barrels/tires, and the like, is also just sensible defensive structures.
Spikes and fires are a little more aggressive or even just 'motivated' than the more welcoming settler aesthetic, but they're not specifically 'evil' or 'raider'.
The impaled bodies do get a little more murdery/unsavory though. Even then, there's some justification. It'd be more appropriate if it was a bunch of recognizable bodies, like a group of gunners or BOS. That would go a long way of having it come across as a warning to outsiders, rather than the more generic "we murder folk" impression it gives off.
It would be super cool if it was possible to have the bodies change dynamically based on the last attack.
Now that you mention it, I really like the idea of a toned down Raider aesthetic, for a more generic 'Wastelander stronghold' type feel. I'll add it to my list of content I can't work on yet.