Watching Complex Action and they did a show about interrupt action. Let’s put one more idea out there based on that!
Last Ditch Effort
Cost: 10 Karma
You always come through in a clutch. When you take an interrupt action and it reduces your initiative below 0 before you normal action in an initiative pass, you may still take your normal action at your pre-interrupt action initiative. You may not take any interrupt actions after your initiative has been reduced to zero. If you’ve already acted in an initiative pass and your initiative is reduced to zero by an interrupt action, you do not get an action in the next pass.