Check out this guy. He's a British actor with phocomelia of both arms. He did a wonderful TV program where he examined 'freaks' in entertainment, in particular one called Seal Boy, and made the point that most of what the old freakshows involved was proving how well 'Seal-boy' could do ordinary household tasks.
Matt Fraser showed how brilliantly he can play drums and do martial arts. One point he made was, am I good because I have no arms or am I good cos I'm better than you?
In answer to Matt's question, I think te reward of BB should come from what anyone, disbaled or not, overcomes to reach that goal. If you can't do the form, so what, as long as you find a way to express/defend yourself within the range of techniques available to you in your training.
That said, the BB shouldn't be the reward. The reward(s) should be what you've been able to achieve on the road to the BB.