The best replacement for modeling paste is embossing paste.

The best alternatives to modeling paste are rated as following:
★★★★★  embossing paste
★★★★  modeling paste
★★★  gesso
★  gum paste
  heavy gel medium

Your alternative for modeling paste is not listed? Suggest!
Speaking about modeling paste, one probably shouldn't forget about acrylics.

Other search terms related to modeling paste and their ratings are:
★★★★★ acrylics
You have in mind a companion for modeling paste and it is not yet here? Propose!



Google Trends

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modeling paste
embossing paste
modeling paste