It's possible. I like it. I probably won't implement it.
Why not? H&Z is the de facto standard in boring/rq gametypes of SoF2. This would probably require at least 8 hours of my time to implement and fully test. In the end it would only be played a couple of times. I enjoyed programming Zombies a lot but it gets boring for the people that play it too easily. People just don't like the core fundamentals of the gametype anymore, so any addition will only be fun for a couple of days/weeks.
Not worth the effort, even though it's a very nice concept.