Still using the tell of the DATA filehandle is the far better approach.

You are correct, and thank you for the inspiration :-) I just released v0.08 of File::Replace with a new copy method:

use warnings;
use strict;
use File::Replace 0.08 'replace3';

my ($infh,$outfh,$repl) = replace3(__FILE__,':raw');
$repl->copy(tell(DATA));
print $outfh "New stuff! ".gmtime." UTC\n";
$repl->finish;

__DATA__
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