Why not use the monitor dissable string or give the server team access to the BIG-IQ just to being able to view things and dissable pool members (with big-iq RBAC access rights this is possible):
https://support.f5.com/csp/article/K12818
https://techdocs.f5.com/en-us/bigiq-7-0-0/assigning-rbac-access-to-bigip-applications-using-big-iq/role-based-user-access.html#GUID-F270A0DF-E3AB-4210-A3B9-C39452D464B9
As your VIP already exists this is perfect for you to import the legacy app and give the server team access to this application for monitoring and to disable/enable the pool members:
https://www.youtube.com/watch?v=fscXGPUtkn0&t=248s
https://www.youtube.com/watch?v=dKX2uJ_DQ-Q&t=301s