Minimum Dollar Deduction across multiple deduction codes

Hello,

We have a employee matching plan that allows employees to contribute to multiple registered/non registered accounts.  These contributions are taken as deductions from their pay.  Employees can contribute either flat dollar or percentage based. The business rule is that there is a minimum dollar threshold that the total contributions across all accounts that an employee contributes to.  If the minimum is not met, the contributions should be $0.

The setup of PDBA's seems to allow for setting a group maximum, but is there a way to enforce a minimum else $0 across multiple deduction codes?

I have been able to set up a custom method to control the minimum else $0 on a single PDBA code, but am not sure how to best apply this to a group minimum.