How to have multiple routes to the same remote VPN in pfSense?

We have a pfSense server in two offices. Our main office has a VPN server configured, and our satellite office has a VPN client configured, using the IP 123.156.88.253 (just an example).

We have just got a 2nd internet connection in our main office. We are about to setup link aggregation within pfSense. This will be on IP 88.175.198.87 (again, an example).

How can we alter the client VPN settings to be able to reach the VPN on either 123.156.88.253 or 88.175.198.87?

Is there a service we can buy like DDNS, except for IP addresses, rather than hostnames? I.e. we buy 189.66.78.145, which - in the background - routes to both IPs?

Or how can this be done within pfSense?

The goal is to have the satellite office be able to reach our client VPN, irrespective of whether one internet connection is down; without causing some sort of conflict that might be introduced by adding the same client VPN connection twice.