Its good to hear that Ultrasone took care of you, never heard of that happening before with the Lyr. I've never heard a peep out of mine while plugging in any headphones, but I have a Zdac that always makes a bit of a nasty noise when plugging in any headphones or IEM's. Parasound said it was safe, but it can freak ya out a bit so I always make sure to have the volume all the way down before inserting the plug. Glad to hear that you didn't lose a nice set of headphones over the incident!
I contacted Schiit Audio, and they said that there shouldn't be any issues using the B&W's with the Lyr BUT they said that they hadn't tried that combo...I won't know for sure until I try and if there are any issues I can simply use them with another amp.