Champ Bsch4477 is correct regarding your filing status options. Since you were married as of December 31, 2019, your only two filing status options to choose from are - Married filing Separately or Married filing Jointly. Filing Single is not a legal option for you or your spouse.
However, you can amend your return before April 15, 2020, to make the change to Married filing separately. Generally, you have 3 years to file an amended tax return, but this is not the case when changing from MFJ to MFS. It has to be done by the filing deadline - April 15th of this year. So, if you can save $1200 by changing your filing status, you should consider making the change.
And you are also correct, you can't account for partial months of 'married' income on Form 8962. For tax purposes and for purposes of reconciling your Premium Tax Credit (PTC), you are considered married all year. There is no difference between getting married on January 1st or December 31 - in the eyes of the IRS anyway. 😉
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