We can make sure of FIVE of the most important things when teaching in China: Pay, Working hours, Location, Housing, and Legal Documentation.

I doubt very much you can do what you claim you can as per the above. As for the last of the 'FIVE of the most important things', please be advised that some of us CHOOSE to teach without a Z visa because there are certain advantages in doing so. I have included myself in that category for that reason.