I've never much liked names that start with
Ben-, but
Benedict is a lot better than most. I like the sound of
Cassian Benedict.
Brenton reminds me of
Brendan, so it could probably grow on me. Maybe
Conall Brenton?
Also, would you be averse to spelling
Conall as
Connell? Every time I see
Conall I feel inclined to pronounce it con-AHL, which is of course is completely incorrect. I could get used to the
Conall spelling, though, if you prefer.