Kerio control and load balancing how to force a specific interface to be used?

Question

proxy

Kerio is configured for load balancing. There are 2 providers: 1 and 2. The usual Internet for the office works as it should with the settings. I have many external devices that break into the server on UDP ports (sound is transmitted). The rule for these external pieces of hardware was initially configured with load distribution across hosts

. Let's say I want the rule to work through provider 1.
How can I force my rule to work through this very provider 1 without changing the NAT translation in the rule?