I had tried the hash-slice method earlier, but it did not work when local-ized:

sub localize_and_call_fn {
    my ($locals, $fn, @args) = @_;
    local @::{@$locals} = (sub {"changed"}) x @$locals;
    $fn->(@args);
}
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I figured I was doing something wrong, but I couldn't figure out where exactly the train had left the rails. Thanks for putting more light on the subject.

Cheers,
Tom