One could rotate the lines yes, but I think it makes things a lot more complicated doing this.
Why not just move your lines a knot more so the trim is the same ?
Most bars has knots on the rear lines and/or the frontlines, exactly for this purpose.
If you rotate the lines, you will have an opposite "wrong" trim for starters, that will slowly get even, and end up wrong again the other way eventually, when the lines shrink differently as they all do.
If you just move the lines a knot after a while (quite a long time), it is much easier and your trim will be spot on, all your bars.
Often I am lazy nowadays, and just let them stretch, and then depower all my bars a tad more so trim is perfect - at least I got the same trim on all bars, which is the most important for me, so I can remember the setting easily, as when you ride you just KNOW where it has to be, even if it changes slowly over time.
But I know I oughta move them all one knot out on the rearlines now - maybe I should now we are talking about it, but when the wind blows you want to go out and not mess with lines, and when lines are rolled up, it would take some time to roll all bars out just for this, but would be the best to do of course
Most of my current bars/lines cant be rotated as not equal length (high V), but I would not do it even if they could, or on those that can.
There is one reason to rotate for some though, if you ride a lot with crossed lines and loaded, the frontlines will wear at the crossing point - so to extend their lifetime rotating to distribute the extremely local wear makes sense.
You can actually rotate them upside down also, to distribute wear over 4 cycles thus extending their lifetime 4 times, but would require loop-knot changes.