I'd try this - use the harder reeds, and sand them down on the back using fine (320 grit or higher) sandpaper on a piece of plate glass. Or, if you have a fine flat file (from a hardware store) you can sand the back on it - just make sure it is reasonably new so that it is still flat. I've done this to some Gonzalez 3 1/4 reeds to get them to be more like 3's, and it works OK.
You could also use fine sandpaper as above, and carefully sand the vamp. Use strokes that do not touch the heart of the reed - start on the side of the vamp and progress to the center of the tip in a single stroke, so that you sand a triangle shaped section on one side of the reed. Do each side, one stroke at a time. Test often. If the tip seems responsive, but the reed is too hard, sand the entire vamp.
You could also use fine sandpaper as above, and carefully sand the vamp. Use strokes that do not touch the heart of the reed - start on the side of the vamp and progress to the center of the tip in a single stroke, so that you sand a triangle shaped section on one side of the reed. Do each side, one stroke at a time. Test often. If the tip seems responsive, but the reed is too hard, sand the entire vamp.