tanyato, we are in exactly the same boat with my 9-month-old. This morning our holistic family doc "prescribed" exactly the plan you devised, starting with one 3-4 hour "shift" for Dad each night, and increasing to two shifts if things don't improve quickly. This includes more crib sleeping, since co-sleeping is lately resulting in an entire family of zombies.
I'm curious - how are things working now? It's been a few weeks since your last post.