M Visa query

I have a 90 day M expiring late January. I am in the process of setting up a company here but will run out of time on it. Can I get a Z with the company part registered? Or can I extend my M for another 90 days to cover the setup period. I can then fly back home to fetch more personal belongings and apply for a Z with a view to residence upon arrival. A 30 day extension of my M will also be too short!