It could work if the personalities of the rabbits involved permit, but it's always best to eliminate the hormone issue before trying it out. Even rabbits who seem bonded initially can have a setback if they're each determined to dominate the other. Personally, I couldn't acquire a female rabbit and not have her spayed because of what Jenny mentioned. The big C is too common in unspayed females, and there's also the potty training issue.
I know you didn't ask for an opinion on this, but I just thought I'd warn you about buying a rabbit from a feed store, because they tend not to care about the rabbits they sale. They're usually cheap enough so that snake owners will buy them as food, so they wouldn't care if the rabbit becomes ill. There are so many great rescues who offer spayed females for significantly less than what you would pay for that procedure. Good luck with whatever you decide.