I second this.
Speaking from recent experience (October last year), it was a straightforward process from beginning to end. From my first contact by phone to getting passport in 24 hours after appointment, they were nothing short of helpful and accommodating (LA office). Again, it is worth repeating. This is NOT the expedited service. Post offices don't even play a role. The whole thing is done through Passport Agencies.
OP, here is what I recommend you do:
1. Look up timelines of your field office here on VJ. I found out mine did same day oath because the date of interview and date of oath were the same for many members.
2. If they do same day oath, plan to gather everything you need for the URGENT TRAVEL passport processing, so that you are all set when your 14-day window opens.
3. Call Passport Agencies and schedule an appointment. If the nearest office doesn't have availability, try another. In your case, seems like a minor hassle compared to cancelling your trip abroad or rescheduling oath ceremony, which I would not recommend.