Instead cancel the rotation, you should create a system that when the play drop the key "R", the post rotate. This form the decoration of the fabric will get more symmetrical. I, for example, create a lot of streets with wall in side, and put the back's poles for wall wold get better.

See the code of the mod: there is nothing complicated, just removed amount of rotations by all electric pole prototypes.
The making of new entities just for graphics is over complicated. If you can make some mod as you suggested, try to do it by yourself, then I add the link to your mod.