Toddlers with LTW-Corrupted Character Files

This is a follow up to my last post. I have una big problemo. Previously, I was getting sims with the wrong LTWs for their aspiration (family sims wanted to be Professional Party Guests etc). Now I have toddlers with LTWs. Clearly, this is A Bad Thing.

It means I have corrupted my character files. Now, it would be very easy to simply change the toddler's LTWs back to 'grow up' using BoolProp, or Insim, or SimPE. But according to other message boards, this problem spells the beginning of the end for your neighborhood.

I realise that this is my fault. I saved a family from my friend's computer and imported them directly into the game, complete with lot. Having read the message boards, I now realise this is Another Bad Thing.

What I want to know is this: is there a way to uncorrupt these files using SimPE for good? Has anyone done it before?

Help would be appreciated!:-P