Modifying ZCOM

[FinalXenocide]

So I have been going about creating my first scenario, and I'm trying to have an XCOM based one (a Chryssalid escapes Site Recon being the basic idea). I want to use the necroa virus and was wondering if there was any way to modify ZCOM's placement at the beginning and its relevant events and such. Even if I have to dig into the code outside of the creator any way of doing this would be great.

Thanks in advance for your response.