Thanks for your interest and query.
Unfortunately Alexander Octave Wyatt's only son died in childhood. My 'Wyatt line' lives on only in middle names, an old framed coat of arms and scantily recorded and oral family history.
The closest I can get is my third cousin, the great grandson of A O Wyatt's daughter Hortense. Unless I find A O Wyatt had brothers born in France who had a line of male descendants, I believe that is the end of the matchable Y chromosomes for that line.
I can only pick away at piecing together the fragments and hopefully finding enough likely corroboration. If you know somebody who knows somebody who may know something (lol) to help in this crazy, painstaking task, please let me know.