Nightly batch for scoring mismatch?

I've noticed that there are some instances that are causing my scoring records to get skewed. Primarily the merging of leads. I was thinking of running a nightly batch to make sure Lead Score = Behavior + Demographic, but I can't seem to pull a list of tokened values, e.g. "Lead Score IS NOT {{lead.behavior score}} } + {{lead.demographic score}}" because the Lead Score field is only accepting numbers.

Is there a way to systematically determine which scores would need to be updated?  (AND/OR, is there a fundamental use case that I'm not thinking of that would indicate an issue elsewhere?)