Hi,
I have added a blend option for this problem that's not to complicated.
First split the edges you need to fillet at the point you wish the fillet
to start to taper.
Draw a circle the radius you require and sweep the edge you want
the fillet to be constant. Now sweep the edge to taper and add the
option for pointy end.
Trim using the sweeps and then blend faces of the constant edges.
The pointed end is then trimmed back to this position and the profile
of the blends and connecting flat face are used to sweep into the
corner.
Barry-H