Dave,
I have to respectfully disagree with your dado idea too.
I agree with Harker the usual method on this is to go to the farthest point of the crack, drill in and insert a dowel that is epoxied in. Subsequently, using thinned epoxy, run that into the crack from stem to stern and keep filling it until it will not soak up any more. Then, use thickened epoxy to finally fill the crack. Sand, paint, hunt.
Otherwise, simply pour in some spar varnish in the crack and say to heck with it and hunt it as is.
Let us know what you decide, then next year send us pics of it at the end of the year