I am somewhat confused with what you are describing about manual vs automatic. You still need a complete chain of trust for the connection to be secure all the way through. There are other reasons to want a load balancer, but all items (Dashboard, Load Balancer, Radius Server) need a cert and need to trust the other certs. So the thing that doesn't support automation will still need to be updated. Are you trying to create a RADSEC connection between just the dashboard and the load balancer and then the load balancer would be having an unencrypted connection to the RADIUS server? I suppose if the load balancer supports that, in theory it would work but I've not heard of that sort of functionality before.
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