Here's an idea and it kind of replicates the use of a benchshirt better than a regular rev band. I hope I articulate this well.
First set the spot pins kind of high in that rack, towards the top.( I'm describing this using the picture of that 1/2 rack that was posted earlier) Then using doubled mini bands or monster minis rig it up on the spot pins as if you were doing speed benching only upside down. It should be band around bar sleeve, up over the spot pin and back around the bar sleeve. Don't put the bands on the bar because they will end up on the bar onm the spot where the j hooks will touch the bar and cut your bands! You may have to use a 2.5 plate to act as a big ass washer to keep the bands on the sleeves if the angle from the spot pins to the bar is large. You'll be able to vary the weight taken off by the bands by moving the spot pins up and down. I like to rig them so that they take off weight at the bottom and are completely slack mid way up the lift. To me this better mimics the way a bench shirt works.
Another option is to simply choke the bands around the spot pins several times to shorten them. You could also just buy the EFS SHORT bands. Either way, it will replicate a regular rev band without having to attach then to something 7-8' in the air. I would get a set of bands from average on down if I were you so that you can have some flexibility. They are cheap and are good to have anyways.