I would recommend a separate person. Case managers have enough of a workload. By adding another piece to their workload, you'll be in the same situation you have now, where they're fighting for more help themselves. You need a separate person specifically trained in financial management.
The guys coming out of the forces are used to being paid semi-monthly. Sometimes they're left with nothing for a couple of months, and then they're put on a monthly amount. It's hard for them to manage.