I've got a charger that can charge at 10A, and up to 12S (though not both at once due to 180W maximum power).
Hyperion make chargers that can charge at 10A, and you can connect them so they work together, for a maximum charge rate of 20A. That's not a cheap solution though unfortunately. For most, 2C will be enough (30 minutes charge from flat is pretty good).
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