So you want an adjustable flat bench for a barbell?
Or do you want a stand alone adjustable bench, then using your squat racks to rack a barbell?
"And for crying out loud. Don't go into the pain cave. I can't stress this enough. Your Totem Animal won't be in there to help you. You'll be on your own. The Pain Cave is for cowards.
Pain is your companion, don't go hide from it."