+1 for the Firefly reference.
Also, sounds like fun.
Rather than have it damage your FSD though, which is probably not a good option to have while you're in supercruise, I would propose instead that the Crazy Ivan works as follows:
1. You're interdicted, and the mini-game starts.
2. You begin "charging", i.e. preparing to execute the manoeuvre.
3. Just as launching into supercruise or hyperspace requires you to throttle up, executing the Crazy Ivan has its own requirement, except that it's a skill requirement.
a) There should be a three quarter marker on the left gauge of the interdiction mini-game HUD, which you have to reach in order to execute the Crazy Ivan once it's prepared. Once it's reached, the manoeuvre auto-executes if charged.
b) If the right gauge reaches one quarter, you need to "recharge" or prepare again from scratch to execute the Crazy Ivan.
So basically, just as Wash needed to have the manoeuvring skill to execute the move, so should we, and tying it into the mini-game helps achieve that.
Your ship still receives damage as though it made an emergency stop, and your FSD cooldown will be extended as well after you disengage supercruise.
If that's too close to just winning the mini-game, then alternatively, activating the Crazy Ivan could have its own HUD replace the interdiction HUD, whereby you have to do something like accurately complete a sequence of movements in time, which will be different each time, or some other skill-based task, like having a virtual U-Turn path appear in front of you, created by your ship's HUD, which you have to throttle down just in time to catch, and manoeuvre to stay on to complete the Crazy Ivan.