Disable attack without banish?

I want to make a unit behave like he has infinitely long cooldown between normal attacks, with no other changes.

How do i do it?

You can just make the unit stop when he attacks, or when he is ordered to attack.

Or maybe give him an orbability and give him a disabled/infinite slow second attack

You can also use a drunken-haze or silence based spell to disable attacks.

There is an ability used by orc burrows I think it is called cargo hold, if you add it to a unit that doesn't have cargo or has its cargo empty it disables its attack