Bulkhead union?

[RedEyeReefer]

Hello all! Putting together a new tank. It uses 3/4" bulkhead fittings for the two returns.
My question is, is there a fitting that will act like a street 90 that will thread to the same the threads the bulkhead uses to tighten to the tank? I really don't want to glue in a fitting. I would think if I ever needed to take the bulkhead out, wouldn't I want to be able to separate the 90 from the bulkhead fitting? How would you get the bulkhead lockring around and off the 90? Or do most just make that a permanent part of the tank and just use a union after the street 90?
Maybe I'm searching in the wrong places or asking for the wrong thing. Or maybe what I'm asking for I don't even need?

Thanks in advance for any help!

 

[Timfish]

If anyone makes a 90° bulkhead fitting it's going to be a custom specialty item and likely will cost a pretty penny or a thousand. FWIW I always use bulkheads with pipe threads not slip joints so plumbing can be redone WHEN needed.

 

[RedEyeReefer]

If anyone makes a 90° bulkhead fitting it's going to be a custom specialty item and likely will cost a pretty penny or a thousand. FWIW I always use bulkheads with pipe threads not slip joints so plumbing can be redone WHEN needed.

I didn't even think of threaded bulkheads on the returns lol. Just going to use a nipple into the bulkhead to a threaded 90* to keep it as tight to the back of the display as possible. Already ordered, thanks!