I'm a Velocity Platinum FF and looking at planning a trip next year using points plus pay on a multi sector / round the world type ticket.

Is it possible to book a multi sector trip Brisbane - Abu Dhabi - New York - Salt Lake City - Los Angeles - Brisbane?

Was hoping to use points to fly business on Etihad to JFK (since reward seat availability seems easier to find going this way compared to on VA flights via LAX). I'd then pay for the internal flights on Delta and for the flight LAX back to BNE on VA.

VA website doesn't seem to allow a routing like this. Any ideas on if this can be done and best way to go about booking it?

Thanks