Dear Copprhead,
I can tell you the answer to your warning...the Rocna roll bar IS in the way of the Selden Bowsprit, at least on our 2009 B31. I know because I bought one, hoping the sprit could be deployed through the hoop itself, but alas it could not be.
Had to settle for a Bruce (Lewmar Claw) anchor, which works well in the Pacific Northwest, but isn't quite the anchor I'd want for going farther afield...
Riyad
Vancouver, Canada