You're welcome. Perhaps you could ask the author of PDF::Report to add support for using external (TTF) fonts? Another method like the following would likely be all that's needed:

sub setTTFont {
  my ( $self, $fontfile, $size )= @_;

  if (exists $self->{__font_cache}->{$fontfile}) {
    $self->{font} = $self->{__font_cache}->{$fontfile};
  }
  else {
    $self->{font} = $self->{pdf}->ttfont($fontfile);
    $self->{__font_cache}->{$fontfile} = $self->{font};
  }

  $self->{fontname} = $fontfile;
}
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In other words, pretty much exactly the same as ->setFont(), but calling ->ttfont() rather than ->corefont() on the underlying PDF::API2 object.

(Notes - a) this'd go into PDF::Report, of course, not your script; b) completely untested; c) uses the same fontcache as ->setFont(), which may or may not be a good design choice; d) could be refactored to avoid code duplication (e.g. have this and ->setFont() call an internal helper routine).)