How to use Gated User Access (or suitable other functionality) for user access within an Organization?

TLDR: Having “member-group” concept where an org-admin can add/remove some set of users would make member access via Resource Group much easier. On emailing the team-support email id mentioned above, I got their inputs quite fast. Based on that, it seems I could recommend making a new Resource Group for this, then move the repo “SpecialModel” to the new RG. Then we would add all the existing members of the original RG to the new RG + the person for whom we wanted to grant access newly. This would work, but I see no concept of “member-groups” in HF. If such a thing existed then it would be much easier to map all necessary members in to any new Resource Groups. I would just select such the existing member-group for “Finance” and have to add just the one new person. Futher, if if Person-3 left the Finance department some day, I could easily edit the “member-group” for Finance to remove Person-3. And the members who are then mapped to one or more RG’s using this member-group is updated automatically. But right now, I would need to every resource group created and delete Person-3 from them.