Administering BR1 when connected as failover

I have a Balance One with primary ISP on WAN1 and a MAX BR1 serving as Backup Priority Group 1 on WAN2. The BR1 appears as “Cold Standby”. It all seems to work. When I pull the WAN1 cable the failover to WAN2 (BR1) works and clients on the Balance One LAN are still served.

What I cannot figure out is how to administer the BR1 from a Balance One client now that the BR1 is in the rack. I cannot connect to the BR1 default address of 192.168.50.1 when I am on the LAN side of the Balance One like I can when I am on the LAN side of the BR1. Is there a way to access the administration of the BR1 from the Balance One LAN side without plugging directly into the BR1 LAN side?

You may enforce subnet 192.168.50.0/24 to WAN2. Please find the screenshot below.