I would think that piece could be formed with bends and cut/welded pieces. Its not like evreything has to be continuous bent tube, especially on a seat frame.
I don't think there's anything wrong with it as it is really. Myself, I've have made a 90 degree right angle from the corner bolted to the body and run back into the tube behind the seat.
I have nothnig more to add, except can you change the <PRP on the front of the seat to say AARP? It should be easy, and more appropriate for the owner