Plan travel to home country for faster H4 visa stamping

My change of employer H1B application which is currently under process and I am currently in the USA.

My wife’s current H4 and H4 EAD both expire in couple of months and its unlikely that her new petitions would be approved by then. So to at least expedite H4 processing, we are thinking my wife would travel to India solely for the purpose of new H4 stamping.

It seems in the travel ban exceptions allowed in mid July, H4 dependents can seek consulate VISA appointments when principal applicant is already in USA. So in view of that, her traveling to India to get H4 stamped sooner, would be a good idea? Would you suggest first get a confirmed appointment and then plan travel accordingly ?

I am little confused because her current VISA is still valid for another two months. In view of that would they let us take an expedited ‘family reunion’ appointment for the H4 extension?