dealing with DB you will find them going the extra line in specific situations and they are not shy closing an account or denying a contract when they feel like it, even if your birth date is different than the same or similared person which is on the list.
We do this mostly the same, however we do not follow a set path but do a case by case evaluation.
Depending on the jurisdiction your client is coming from the risk assessment can be from: No,No,No in regards of a US client in a divorce to a No Problem for the same divorce in a different jurisdiction.
Generally banks do not like the risk to be part of a lawsuit.
Anyhow I have seen DB taking such clients when the income was okay.
Your client with his criminal record is obviously long out of that and needs that record purged, and needs to use a special purpose company which originates the money and have a bank fronting the origin, he should be okay with some banks, like BBVA or Santander or Fortis or even Societe Generale, if he is US God help him, he needs serious counsel.
You would probably be surprized to what length our assessment goes, we go the triple extra road in our environment but we are always looking longterm. The price quote is not a surprize.