Unsubscribing or excluding based on one list

One of our clients has multiple lists, one for their 'members' and others for ticket purchasers, volunteers, etc...

When announcing an event, they send a notice to 'members' first, then everyone else a few days later.  They want to be able to clear out anyone who appears in the 'members' list from their other lists.  Is there a way to do this using segments?

If not, I've got a script that will do it via the API but it will means hundreds of requests, which seems like overkill.  Not only that, I think that any emails I removed would be unsubscribed from *all* lists, including the original 'member' list.

Sort of convoluted... any suggestions or thoughts would be much appreciated.

Alex

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