I bet you could narrow it a little around the knot, but if you feel it's goin to blow it'd be better to have a little tearout then broken lol. How bad of an angle is the belly at? if it's pretty extreme you could remove wood similarly on the other side of the belly, or if its minimal just remove wood normally. Watch and see how much the knot area bends when you floor tiller and just make sure to lighten the stress a little around the knot and leave a little more wood around then normal. hope i helped