There are many plastic modeling techniques and materials that might work. Years ago, I saw some modelers putting baking soda on a joint on a 1/72 airplane then adding drops of cyanoacrylate glue. It foamed up and formed a hard filler plastic, although white in color, that could be ground and shaped. Black carbon dust or dye might help.
Also, plastic filler material can be bought.
Another oldtime trick of plastic modelers is to grind up plastic in the color you want and mix it with acetone. It will form a soft plastic that does not work easily but that is a suitable filler and is easy to make. It may shrink on drying so you always add more than you need on the first application.
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