Thanks for keeping us up to date on the progress. It sounds like you were able to make a bad situation into a great one.
I wanted to note that when I picked up me 2013 E93 I asked my sales rep what the requirements for the break-in period were. He looked squarely at me and said this engine will protect itself. You can race it, redline it, whatever. you're not going to damage this engine. I was really surprised to hear a dealer say that to a customer. I will say though that during my first 1000 miles, especially during the cold-start period I would accidentally redline it quite a lot. Probably around 20-25 times since I've owned it. Hopefully if anything goes wrong, that won't be scrutinized.
So glad you got your baby back. Best of luck!!
2009 AM V8 Vantage Conv - Berwick Bronze, Quicksilver Exhaust
2013 M3 Conv - (RIP) thanks to uninsured a-hole
2004 Porsche 911 C4S Conv