BB Style :: Temporarily Disabling Specific Email Accounts?

My company has a Blackberry "Style Flip" 9670 for our sales-people traveling in Northern Canada in the Yukon area. This phone goes with whoever is going on that particular trip, however it has 5 different email accounts associated with it for the 3 users that share it.

I don't know if this is possible with a Blackberry or not, but we would love if there was an easy way to temporarily disable the email accounts that do not belong to the person carrying the phone at that point in time.

The way it is now, we have User A (2 email accounts), User B (2 email accounts), and User C (1 email account) sharing this phone. If 'User C' is presently up north and has the phone and sends an email to 'User A' and 'User B', the email is still received on the shared BB for both 'User A' & 'User B' and wastes a lot of precious bandwidth. The main dilema is the two users with multiple accounts on that phone receive a ton of emails daily. This means 'User C' may have 1 crucial email waiting to be received, but has to wait for all of 'User A' & 'User B's' emails to be received before getting the important email.

Is there a way without deleting the accounts each time to turn certain email accounts on and off?