You could use a long handle on the lifting bar and blocks for it to set against for each position you want it to be at (and take the pressure off of holding it), then drill a hole for a hitch pin (or even simpler -- a Cat 1 pin).
For what it is worth, pay attention when using the BB when backing. It is a great way to bend your lower links. I usually used mine (5' 6" Economy on an old Case VAC) more as a smoothing blade by tilting the top link so that it was all that rode on the soil.
You will quickly find you need (want) top and tilt.
Now to find a 7'/8' one for Blueford.