Rich
A method I use to get a good clean quill after I split it, is to get two square edge boards and put the feather between them with the quill sticking out the edge, and place a clamp on the boards to hold it tight, then you can sand the quill to shape.........It shouldn't hurt if the feather has some bend, a lot of feathers do...........If the bend is un natural I would think you could clamp it and hold it over steam and that Might make it straight.
wvflintknapper