The best replacement for strong bases is weak bases.

The best alternatives to strong bases are rated as following:
★★★★★  weak bases
★★  strong nucleophiles
★  strong acids

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Speaking about strong bases, one probably shouldn't forget about weak acids.

Other search terms related to strong bases and their ratings are:
★★★★★ weak acids
★ strong acids
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strong bases
weak bases
strong nucleophiles