If we're using multiple statements anyway (not doing so was the point of my obscure ditty), I'd shuffle things around.

{
    my @key = sort { $a <=> $b } keys %h;
    @h{ 0 .. $#key } = delete @h{ @key };
}
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That seems like a cleaner separation of concerns. The symmetry of the second line here seems more pleasing and makes it more robust — it remains valid regardless of how the list of keys is generated.