My FSUIPC7 ini file has this at the bottom.
[Auto]
1=Lua hidAlphaButtons
2=Lua HidBravoButtons
[LuaFiles]
1=hidAlphaButtons
2=hidBravoButtons
the lua files are in the same install folder as the FSUIPC7 exe and ini file. When viewing the switch and button mappings in FSUIPC7 the Bravo rocker switches should show up as Joystick 64 or 65.
The other important part of the lua files is that they assign different offsets for the Alpa and the Bravo.
Alpha lua
– i.e. DWORD offsets 3340 onwards (3340 = ALPHA, 3344 = BRAVO)
ipc.writeUD(0x3340, buttons[2])
Bravo lua
– i.e. DWORD offsets 3340 onwards (3340 = ALPHA, 3344 = BRAVO)
ipc.writeUD(0x3344, buttons[2])
If you only have the Bravo than maybe try assigning the 3340 offset in the lua file instead of 3344 and see if that works.
I have both controllers and all the switches are being seen by FSUIPC7 as coming from joysticks 64 and 65 based on those 2 separate offsets.