The best replacement for mixed grip is hook grip.

The best alternatives to mixed grip are rated as following:
★★★★★  hook grip
★★★★★  double overhand
★★★★  overhand deadlift
★★★  straps
★  overhand

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Speaking about mixed grip, one probably shouldn't forget about straps.

Other search terms related to mixed grip and their ratings are:
★★★★★ straps
You have in mind a companion for mixed grip and it is not yet here? Propose!



Google Trends

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mixed grip
hook grip
double overhand