Never mind the Aesthetics, how about a level 60 trait that once you level more than one job past level 60 opens up the cross class abilities in each lvl 60+ job to be available for use by the other lvl 60 jobs, without restriction.

Call it Peerless Skill or something. I mean if you have a character that has reached the pinnacle of experience in multiple Jobs, it seems only natural that you would be able to demonstrate your mastery of the jobs by cross skilling them more flexibly. Of course, this trait would only cover the cross class skills available at lvl 60, and not beyond - just in case the future holds more....