Accessing your device "blind" is really easy, just boot it up into maintanance mode with ubiboot kernel.
Then you can copy your SMS database to computer and open it with sqlite3 compatible editor.

Formatting your MyDocs (which is normally the partition exported by USB as memory device unless you have tweaked it) will not destroy your messages et al. as those are stored on home partition.
You need to flash your device in wipe mode to get rid of that.