The best replacement for dmsa is edta.

The best alternatives to dmsa are rated as following:
★★★★★  edta
★★★★  dmps
★★★  dmso
★★★  mag3
★  dtpa
★  chlorella
★  zeolite
  mcug
  mag 3
  succimer

Your alternative for dmsa is not listed? Suggest!
Speaking about dmsa, one probably shouldn't forget about chlorella.

Other search terms related to dmsa and their ratings are:
★★★★★ chlorella
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Google Trends

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dmsa
edta
dmps