Interesting thought, and i'm also interested to know the answer.
The only other etymology i've seen suggested is Julio Caro Baroja's
idea that bruja/bruixa comes from mBRSH, an Arabic or Moorish root
referring to the datura plant family.
Max
>does any possibility to connect Celtic Brixta- =
>incantation/Magic/Spell
>with Portugues Bruxo = Magicien
>with Catalan Bruixa = Witch
>
>I think theses words don't come from Latin root