All is possible you want to do. A lot of "it depends". And extra checks for legacy protocols in use like SMB. It will be end up badly if you start by try and error and half-knowleadge. You fail then 100% and can claim but for 50% it should work how i thought.
Have your local account team involved. If they can not answer they can reach out for help. FSE group for example would come to my mind.
A/A replication should only be used if you have a load-balancer in place.