RIM hasn't officially said yes or no to this, but I can't see why it wouldn't work. Publisher / Subscription HA works; so should this. I would follow the directions in the DR guide and you should have no problem. I'd also recommend setting up a DNS alias in your BES Configuration Manager to point to your SQL instance. Then if in the event you have to move your SQL db, you don't need to touch BES, just modify the DNS entry to point to the different IP (if you have permissions to do this).
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