Possible to change sponsors/petitioners for child visa process?

[ksn 0]

I have applied to bring my two stepsons over from Africa, where they are now. I am a USC and my husband (the father of the boys) is a LPR, but he has been recently approved for Naturalization, and is to be sworn in as a citizen soon. We live in the States; the boys live in Africa with their mother. We have a NOA of the I-130s from USCIS for both boys, and the process is on it's way to NVC now. Once my husband is sworn in as a citizen, does anyone know if it's possible for him to "take over" the visa/application process as the boys' sponsor/petitioner, instead of me, without losing their "place in line," so to speak? And if that's possible, how do we go about doing it?

Also, does anyone know if I remain the sponsor, would I be required to travel all the way over to Africa to that consulate/embassy to do the interview with them and then travel with them, or can they go to/do the interview themselves without me there? We were planning to have my husband (their father) go to Africa once they already had their visas to then travel back with them to the States.

Any information you can provide is appreciated. Thanks - ksn