The solution to add a CLS-like skill that turns the strong zombie into a weak one is a clean solution that makes it possible to use it any way you want. To scale well, the skill could just invert protection, health and defense stats on mods. It could probably affect the offensive ones as well, just rather not tenacity and speed. I think we ought to have some way of making this skill work as Han's shoot first though, so we can set the mode before the opponents move to make it really useful.
The other obvious solution to the zombie problem is to cap Asajj Rampage stacks at a level at around 100K damage or so. It will have very little effect, if any, in arena, and will tone down the damage a fair bit in the raids without making it useless.