Hi I am a Singaporean married with a China Nationality holding S'pore Certificate of Marriage

Patrick, it is possible. You should first prepare the relevant documents including your passport, the application form, a passport-style photo, valid registration form of temporary residence, an invitation letter from your spouse and copies of spouse’s Chinese ID card, and your marriage certificate.
Next, go to the exit and entry administration of the local PSB to convert the work Z type to Q type.