I wouldn't wire the panel lighting into the cabin lighting circuit which will probably be on when you are aboard. If the lighting circuit were turned off you would have to get out of the V-berth to go to the panel to turn the V-berth reading light on.
It bothers some and not others. A separate switch makes sense. I wouldn't dedicate a breaker to it. You could install a toggle switch beside the panel for this.
Living aboard in Victoria Harbour