If you do want to experience BB for less money, try sharing or splitting an entree. Sharing costs nothing. The server will bring an extra plate, and you will divide the portions yourself. The portions are generous and the food is rich. The split fee is $12. Each person will get an appetizer, and the kitchen will divide the entree and sides. We love BB, but not for the food. Mainly for the experience and fun. CO is fun, too, and much less expensive than BB. Fun people watching from the patio. But not the same atmosphere at all. Ride POTC and look at the restaurant as you go through the bayou section. Try to ride when there will be people dining there so you can really see what it will be like. If you want to dine there, fine. If not, you can cancel your reservation right after the ride using the app.
And if you want an earlier reservation time, keep checking online/the app/calling the Dine Line to look for cancellations. It is quite possible that you could get an earlier time before your trip starts.