Honestly, your best bet is to go into the Court and to speak with the judge. Ask the judge for an extension and he usually will grant you one (assuming, this is your first extension). If you are really scared to go in to Court, then you can hire an attorney to go in and make this court appearance for you and request an extension.
This answer is provided solely for informational purposes only. This answer does not constitute legal advice or create an attorney-client relationship.
You could hire a lawyer to go in and make the appearance for you if you don't want to risk getting arrested. It shouldn't cost you more than a few hundred dollars to do so. Alternatively, you can ask the judge yourself.
Certainly, being arrested is a possibility, but probably not likely. Predictably, the judge will grant your requested extension. If you want 100% assurance against getting arrested, have an attorney go in and request the extension.
Retaining an attorney to appear on your behalf may be more economical than paying for the bench warrant. In addition, having an attorney appear on your behalf is advantageous because there's no one to slap cuffs on and remand into custody. You don't necessarily need to go in before you have an attorney. My recommendation is to contact a few attorneys for a free consultation. I wish you the best and hope that everything goes your way.
The response above is not intended as legal advice since it’s impracticable to provide thorough, accurate advice based upon the query without additional details. It is highly recommended that one should seek advice from a criminal defense attorney licensed in your jurisdiction by setting up a confidential meeting. Moreover, this response does not constitute the creation of an attorney-client relationship since this message is not a confidential communication because it was posted on a public website, thereby publicly disclosing the information, which is another reason to setup a confidential meeting with an attorney.