I wonder whether you really want to move it to it's own hash. That involves making a copy of the anonymous hash in the AoH. I would suggest what you want is to assign ( to a scalar or to some other object ) a referencec to the anonymous hash, so you can manipulate it without involving a lengthy addressing procedure:

my $hashRef = $arrayOfHashes[0];
my @hashKeys = keys %$hashRef;
# or more realistically ...
for my $key (  keys %$hashRef ) {
    something involving $hashRef->{$key};
}
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