The best replacement for potassium carbonate is sodium carbonate.

The best alternatives to potassium carbonate are rated as following:
★★★★★  sodium carbonate
★★★  bicarbonate
★★  potassium bicarbonate
★★  calcium carbonate
★  cesium carbonate
  potassium hydroxide

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Speaking about potassium carbonate, one probably shouldn't forget about hydrochloric acid.

Other search terms related to potassium carbonate and their ratings are:
★★★★★ hydrochloric acid
★ barium nitrate
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potassium carbonate
sodium carbonate
bicarbonate