I commend OP as well and agree that he should be getting something from UA to go along with his good Karma.
A few years back I was in a similar situation, on a UAX flight I had selected a bulkhead seat. The passenger, in this case was blind and escorted onto the plane. For some reason or another the seat I was in was the best one for them, and the FA was ready with a new BP for me AND a sky-kit. I didn't even ask, nor would I have complained but there she was ready to thank me for moving. That's how it's done.