You only get that if you destroy them though, I'm talking about simply reporting them
Possible, if you got a tip-off reward for crimes against you that you got as soon as you got pulled down, but I suspect there would be ways to exploit that. Especially if it was a fine levied against the player that did it. (Remember, to make this symmetrical for the trader them "winning" by escaping has to be a negative experience for the
player that tried to pirate them, and it has to scale with the potential gains the pirate could have made if they "won".)
Q-Ships were world war 2 combat ships disguised as cargo ships and mixed in with convoys, so that if the convoy was attacked they could drop the fake sheeting pretending to be cargo and return fire, usually with 5" guns. Some had catapult launched fighters to protect against air attack. It's what the Keelback is supposed to be in game, something that externally looks identical to a defenceless Type 6 but is actually armed and armoured.
But it doesn't matter because you can
tell it's a Keelback before you get near enough to be suckered in.
If you could only tell before the interdiction the vague weight class of the ship you were interdicting, then a player pirate would have to take actual risks because is that 2000t signature a defenceless type 9 carrying a fat payday or a haz-res stomping Cutter and they'll die of old age before they get through its shields?