I will not second guess your reason for doing this like others have.
I believe the best suggestion you got here was to use the disconnect with the fuse. This allows all memory to be active while the main line is virtually disconnected. This would also keep your security system operational.
If you can't find one of these gizmo's, all you have to do is put one of the disconnects in series with a battery cable and put an inline fuse around it with about a 1.5 or 2 Amp fuse. If someone does hit the starter, it will immediately blow the fuse. At that point you will be no worse off than if you had disconnected the battery, because all memory will be lost and you will have to risk a surge when reconnecting. Also you will have to replace the broken window that the thief caused.
I would suggest that you take Steve Brotherton's comments to heart. Constant voltage spiking could eventually cause problems not to mention that the engine will have to "retrain" each time memory is cleared.