Allow Use of Single Payment Voucher for Processing Refunds from Accounts Receivable

We're in the midst of designing a solution for this Idea from the Idea Space and are wondering about the method of refund when using a Single Payment Supplier.
We're wondering if the refund method has to be flexible enough to not only create a check for any AR refund(s) for the customer or is the expectation that you would refund using Direct Debit, EFT, or other methods...and not simply create a check for the refund.
If the Customer (via the Customer record) is already linked to a valid Supplier ID, all is good and we use that Supplier and the attributes there for a reimbursement.
However, if the Customer needs to use the Single Payment Voucher, we need to figure out how to reimburse the Customer for the credit owed to them. Could you please weigh in on what your desired capability would be?
Also if you'd like to be included in a Focus Group discussion to review the proposed design, could you please let me know with contact information, so I can confirm your organization has a current Customer Participation Confidentiality Agreement (CPCA).
Thank you!