Let me ask you a completely different question... what do you want to achieve by splitting the sheets? You are faced with the same problem as if you split the sheet into two parts: keeping them safe so that no third party can access them.
 Splitting the sheets even more only bears the risk of making a mistake during the transformation or recovery. In my opinion, the added value of frequent splitting is - compared to the effort and the error-proneness - quite low.

If you are doing this for another reason (trying out different methods of how to split the sheets, ...) then this is of course a different issue, but I don't think so because of your question.