This is exactly what I had in mind too @Lil bear. Worst come to worst, if we do not receive the NOA and extension letter in time for the petition submitted by that trustworthy person, we will return to the US before the expiration. However, if we receive the NOA, we will complete our travels and return as planned.
Only issue I can think of is if we also receive the biometrics appointment date prior to 12/22? We would have to be in-person in the USA. My plan is to call ASC and re-schedule the biometrics appointment for after 12/22 when we are back in the US. Would this be an issue?