Migrating DT/LT clients to new Avamar grids

Hi all,

I've approached the limits of my Avamar expertise, so could use some help with the following

I've inherited two Avamar 6.1 grids that are in dire need of a tech refresh. To this purpose, we've installed several newer virtual grids. I'm now in the process of migrating roughly 5000 DT/LT clients from the old grids to the new grids. This is where I run into two challenges:

1. There was no real client management on the old grids, resulting in a large amount of clients that no longer exist. I would like to clean up all the clients that haven't contacted the grid in >2 months. To my knowledge, MCCLI and the GUI don't really allow you to delete or retire clients based on just the last contact date. Does anyone have specific scripts for this? I'd like to do a "if client hasn't contacted grid in 2 months, retire client".
2. Using the enterprise manager, I've managed to move a large amount of active clients. Unfortunately, moving the clients is a manual, bulk task. If a client is offline, the move fails. This means that I run into a challenge where a client could be briefly online and contacting the Avamar, but I might not have a move active. Is there a way to persistently advertise to clients they should move to a new Avamar, without having to periodically trigger a move and hope for the best? Something like a HTTP 301 "permanently moved" sign...

Cheers!

Jon