I fail to see what is “backwards” about the BMS E bracket. If you don’t want to use it, fine. Use the indexers. It’s not difficult, they display the same information and can actually be more beneficial than the E bracket since the AOA indexers are not quite as sensitive.
The Hawk, or at least the Goshawk, displays the information in at least the same basic way, though the numerical on-speed AOA values obviously differ.
I don’t know where this guy’s getting his information from, but AOA will adjust based on aircraft weight whether because of fuel, stores, etc. To achieve the same relative AOA, a heavier aircraft must maintain a higher airspeed. The indexer and the bracket on the HUD get their information from the same source.
Stop making up random numbers and fly the jet on-speed per the AOA indexers or HUD.