I cannot speak for all jurisdictions, but many of them have a procedure where an attorney petitions the court for a judgment debtor exam. If the court grants it, a court order issues where the judgment debtor has to show up at a particular time and place to answer financial questions and is subpoenaed to bring financial documents.
The judgment debtor exam is given under oath - if you lie, it can be perjury. And a judgment debtor exam is not a fun experience. A lot of people settle before having to attend one just so they don't have to go through it.
Now, the really special part of a judgment debtor exam is that it is a result of a court order.
If you don't show up, that's usually a failure to appear. An attorney can then ask the court to issue a bench warrant.
In other words, you get arrested.
So, yeah, if you really want to put the screws to someone, a judgment debtor exam is the way.
I can't say if it would work like that in this case or even if it is possible or advisable. However, if someone shafted me....