That works. Since the animated series is just after TOS, you have a 100-year span to play with. Your scene already shows the pirates attacking a Romulan-War era civilian transport (might also have been used after the war). But of course pirate will use any ship available, unless they all get their ships from their government. And who says that they couldn't be using 100-year-old ships with suitable upgrades? You could show the pirates against Daedalus class ships or any of my or Bernd's pre-TOS ships or even against Constitution ships.
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