Oracle:
I use wire cutters too, and then file the edge so it looks better.You can also use 40-pin 1-row 0.1” PCB Female Machined Round Header - dipmicro electronics, which looks easier to snap.
I had too this type of headers. They were perfect, because you could cut them easily with a wire cutter without breaking anything.
Now, I have a wire cutter, and a retractable sharp blade.
What do you think about it?