DAG: Full Re-seed of Mailbox/DB - can we cancel? Faster way to failback DB?

Hi-

We have a 2 server setup - each in a different physial site/location.
We are in a single site AD/Forest/Domain acrioss a WAN( Not ideal we know).

Here is the current mailbox status:

[PS] C:\>Get-MailboxDatabaseCopyStatus -Identity ED* | select name, status | sort Status | ft -auto

Name             Status
----             ------
ED-MB01\Server1  Failed
ED-MB02\Server1  Failed
ED-MB01\Server2 Mounted
ED-MB02\Server2 Mounted

[PS] C:\>Get-MailboxDatabaseCopyStatus -Identity ED-MB01 | select name, status | sort Status | ft -auto

Name             Status
----             ------
ED-MB01\Server1 Seeding
ED-MB01\Server2 Mounted

We want to move/re-mount our Mailbox(MB01) back to Server1 from Server2.

We were told to suspend, reseed(replicate) and then mount.

However - it appears we are running a full seed and wonder if this is the correct process?

It appears it will take days and days to finish.

Could we just cancel the full re-seed and start Information Services and would the DAG would switchover mounting our original copy of our DB in our location?

We have apparently failed back before in a few hours - completed by an admin that is not here.

Thanks,

-P