Could this one work as a piracy style?

[Zeb Harley]

Yeah but is it a demand really?
Also, if you tell the guy "if you call for help, you're dead" and he starts spamming system chat with things, can you just end his life?

You can, I guess. The piracy is over, there was no peaceful solution and it comes to combat. PvP-rules apply.

When I, personally, was dumb enough to step into a pirate's trap and I do not want to pay the pirate I usually summon EVERYONE who could give some help in populated systems (if I am feeling outgunned, that is.)
The pirate still has a chance to take out my ship (if noone arrives in time) and to collect the cash out of my hold (200k in Freighters, 2mil in my Supertransport). I always keep to the 2 hour-rule when shot down.

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for those who missed it: the moral of it all is ----> traders with teeth are fun for pirates. - within reason.