How to limit the number of IP addresses used on Transmission Configuration

Summary:

We want to have a PPR (payment run file) sent direct to the Bank using "Manage Transmission Configuration" and

Secure File Transfer Protocol for Static File Names

The Port used has already been open on the "egress access control rules"

The connection is failing, as the bank has a limit on their end on how many IP Addresses they can whitelist, and Fusion Gen2 has a lot more IP's compared to what the bank is willing to whitelist.

I've raised an SR and they just said to "Whitelist" everything, which the bank is not willing to do.

Certainly , there must be a way to set a specific or a small list of IP addresses to be used during the transmission of a payment file to the banks?