Fighting Styles just means the skill applies to the style rather than the individual weapon.
I am not aware of a conversion kit. Obviously our present license is with MRQII so that is what we are writing to, but the basic mechanics are pretty much the same as BRP.
I really hope you enjoy the rulebook and adventure - we really did have a blast putting them together. Presently we are working on the fourth C&C release, No Man's Land (we have one frenetic schedule for the next year or so) - wonderfully grim stuff, I hope.