Just cut it off with a small saw when it hardens to the level of the soles heels.
Can you make heels into wedges.
Most shoe shops sell them for about 50p.
You can buy new tips for the heels though to stop them being slippy.
The main reason to convert high heels to wedges is for more comfort.
Cut the fabric into four rectangles that are the length of the wedge from the center back of the heel to where the sole touched the ground and the height of the heel from floor to joint see the orange lines in the pic.
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That way you would have the rigidity of a full wedge heel without the weight as if it were full wood plastic or whatever the rest of the sole is made of.