You can do /follow focus by the way.

As for the turning thing, if you have an unused keyboard key you could bind it to turn both characters at the same time. Then when you need to spin you hold that down and both characters would turn instead of just the one. You would handle things mostly the same way except when you got your distance you would turn with that instead of with the mouse like normal.

The other option is to use Arcane Missile because it will cause your character to face the target, no matter which way you start out facing. Of course, you don't get the frost effect but your other mage is frost bolting so the creep will be slowed.