The best replacement for confit is sous vide.

The best alternatives to confit are rated as following:
★★★★★  sous vide
★★★★  compote
★★★  braise
★★★  comfit

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Speaking about confit, one probably shouldn't forget about flageolet beans.

Other search terms related to confit and their ratings are:
★★★★★ flageolet beans
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confit
sous vide
compote