It should be doable but since I am not using threaded messaging, I do not know which registry key to look for. Howver, you can easily do it for Pocket Outlook as it is stored in the following entry:
HKCU\Software\Microsoft\MAPI\PropertyPath
Default value should be \Windows\Messaging and I changed to \Strorage Card\Messaging.
If you use Spb backup, they have a free tool called Spb Backup Unpack, which can take a backup file and dump it on your PC, including the registry in text format. Once dumped, you can do a global search and find out which registry key has value "\Windows\Messaging".
By the way, I never lost any email or txt messaging due to storing on the card but again I backup them often just in case.
Jeff
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