Most builders don't do anything different for a shorter or longer draw length, they just mark the bow at your draw length. Think about it, if they did, the marketability of those bows would be greatly reduced for anyone who doesn't have a short or long draw length.
If you want a bow that draws 50@26, buy one marked 55@28 or order one at 50@26. (It will be a bow that draws 55@28 and marked 50#@26). That's what most bowyers are going to build.
BTW, that's sufficient for bear. Good luck.