I would assume frame warranty would be fine this way.
Though I don't believe it will impact the warranty, that is a great question. 3K pin weight on a longer "lever" definitely will increase the amount of force upward to the frame. It's out there on the web someplace regarding the force applied with offsets. I did not try to understand it, well I did but gave up. Essentially it's not just the lever but the entire system...torsion, grease on the ball, pivoting of the ball in the socket, etc. There is a point in time in the levering where the full increase occurs but that increase is "never" really applied fully. I think, not sure,
@George might have talked about this before here.