Move Transactions to Household and custom data

So, we have a custom table that holds additional information that we need about contributions.  The table keys off of the customer number, but that doesn't get updated during a "Move Transactions to Household" operation, so we have a number of rows out of sync with the transactions they're associated with.

With merging, there are places to add extra scripts to keep custom data updated.  Is there anything similar for these functions, and has anyone had to deal with this issue before?