Provided the port channel/ifgrp and the e0c are in the same broadcast domain, if you want to do this without ONTAP complaining:
add the a0a ports to the same broadcast domain as e0c
start an external ping going to one of your lifs.
Migrate the port from home-port of e0c to a0a.
make sure the lif goes to a0a
if the ping continues, all good. If not revert the port back to e0c and fix your network.
when it’s definitely working, modify the home-port from e0c to a0a. The port should now be home since you did a migrate and a revert.
You can remove the e0c ports from the broadcast domain