CHAOS is about to happen with BRU and MXP. The A330 dropped its MXP trips and the 7ER dropped its BRUs trips. And each aircraft is going to pick up the others rotations. You will have 23k obligations for your rotations that was dropped.
Not sure if swapping to a different trip will help. Realize with 23k they can give you a trip that might not start on the same day as the original trip and ultimately just has to get back the same day that you were going to get back. In other words they could give you a two day trip.
I think you misspoke when you questioned yourself about reroute. They could assign a trip from now until 6 hours after your original sign in for your recovery flying.
I was on the phone with ALPA scheduling yesterday clarifying all of this. I have 4 MXP trips that were dropped for the month. They more or less made me a reserve (Short call) pilot for the month.