Just use the new address going forward. An earlier poster was incorrect. Your case moves forward through the Dept. of State, not USCIS. Once the visa is issued and used, the file will go back to USCIS with the new address and the address in the USA where they are to send the green card.
I'm more concerned about the source of confusion about adjusting status or consular processing. If USCIS is saying they don't know which, then the gave you a way to tell them, and they won't send the case to the National Visa Center until they get an answer. You said your I-130 was "accepted". Do you mean "approved" or is this a request for information from them prior to approval? Please clarify, so proper advice can be given.