I am sorry you are being put through this manmade stupid process! Without knowing all the details of your predicament I dare say that trying to extend the process three months may be too risky.
You could, of course, play the ?humble? card, tell the elders you are spiritually week and the whole Christmas thing was a mistake and that you need somebody to study the Bible with you and help mend your ways. How sincere you can make it sound may spare you a disfellowshipping.
On the other hand, you may accept the fact that Christian freedom has a price and you may need to stand firm in your convictions and pay it, regardless of the pain it may cause.
With respect to reaching out to the elders with arguments from the scriptures, you may try. If they are typical elders, they will hate someone trying to teach them something. This ?bad attitude? will compound your problems.
The cleanest way to leave is writing a letter of resignation and walking away. This will spare a lot of pain and will keep the matter more private which, in the long run, may allow some to reach out and talk to you, especially your family members. As to the letter of resignation, I will make sure that each elder gets a personal copy AT THE SAME TIME or thereabouts. This will increase the chances that he will read it without the pressure of being in front of the others. This way you can get as personal as you want to the individual.
These are my two cents. I will be praying for you and your family. May the wisdom and the comfort of the Lord guard you.