Just change your skyport to Barak-Nar. Then Brokk can buff your Endrinriggers.
I like both the Admiral and Navigator aside from the Endrinmaster with Dirigible.
I really like the Thunderers. Im taking 10 with no special weapons.
There is no reason for you to take Brokk Grungsson Lord-Magnate of Barak-Nar. His command ability only works on Barak-Nar units. Rather take another Endrinmaster with Dirigible Suit. It’s 20 points less and you will get a lot more from him.