Angrist immediately pops into my head when I think about dwarf knives (pity Tolkien never elaborated on the subject
), and I like your idea of dwarves liking angles more than curves, we can definitely see this in their architecture accomplishments. The second to last picture that you have there reminds me of something a dwarf would use: something that can do multiple tasks.
I'll look deeper into this and see what I can find.