Yes, I did it. Give me a day and I will send you photos.
I did the Camco 5500W element with the Brewershardware & Tri-Clover connection.
Welded on a long ferrule, since the tri-clover had to have room to close (spinning the lock nut).
---- okay, jpalarchino, this is where I made it work ----
Then, I bended the Camco element to fit through the ferrule and also inside the kettle.
It is pretty flexible, so was able to make it work. But, a straight element may be better.
My only concern is the space inside the ferrule, if it will fill with gunk and may be hard to clean out.
*** UPDATED - Photos below ****