The best replacement for alkali metals is alkali earth metals.

The best alternatives to alkali metals are rated as following:
★★★★★  alkali earth metals
★★★★★  alkaline earth metals
★★★★★  halogens
★★★  transition metals
★  alkali metals
  earth metals

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Speaking about alkali metals, one probably shouldn't forget about halogens.

Other search terms related to alkali metals and their ratings are:
★★★★★ halogens
★★ water reaction
halogens reaction
cold water reactions
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alkali metals
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