How to Enforce Group-Based Directory Permissions on AWS EFS?

Hello,
Does anyone know how we can address the following issue?
In our Federal Government agency environment, we have EC2 instances (Linux – Red Hat) using EFS storage. We have two groups of users: the Sampling Group and the Processing Group.
Our directory structure is:
/data/sampling/ /data/processing/
Required permissions:

• Sampling Group
  • RWX on /data/sampling/
  • RX on /data/processing/
• Processing Group
  • RWX on /data/processing/
  • RX on /data/sampling/

I understand that traditional ACLs are not supported on EFS:
(Reference: AWS limits — NFSv4 unsupported features)

https://docs.aws.amazon.com/efs/latest/ug/limits.html#nfs4-unsupported-features

Given these constraints, what are our options? How can we achieve the required permission model while continuing to use EFS?
I appreciate any guidance or recommendations.
Thank you.