With all the joinery completed on the legs, I could work on rounding over their edges.  I went slowly, raising the 1/2" radius bit a little each time around the circuit of all 4 legs.  I stop/started short of the two stand-offs - the raggedness there will need to be blended-in by hand later.  I continued raising the bit until there was no flat spot left on the edges.

Surprisingly (to me), I was able to radius the tips without any tear-out.

With the edges rounded, I could see how much further I needed to cut-in for the narrowed stand-offs.

I chucked-in the core box bit again, set the fence, and then kept nibbling away at the excess.  Again, I took my time, raising the bit a little each iteration and checking the result.  I kept going until the concave radius from core box bit aligned with the convex curve of the edge.  The arrows below show the inflection point.

With a round file and some rough sanding I'll be able to blend-in the transition just fine.   And we all love sanding, right?