Merge crysis and warhead campaign? Thread

Hi

Since warhead is spinoff of crysis 1 I thought it would be fun to merge warhead levels into crysis 1 and play the whole as a single continuous campaign with levels alternating between psycho and nomad when they diverge, something like Spartan and arbiter in halo 2. Is there a possibility that this can be achieved without much complication since both games are pretty similar based on the same engine and how may I go about doing it?