Try to change the symlink name (remove the old one from /usr/local/bin/) like:

% ln -isv /opt/perl/bin/perl /usr/local/bin/myperl
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Then check if /usr/local/bin is in $PATH and try:

% myperl -V

or if not in $PATH

% /usr/local/bin/myperl -V
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If all good use 'myperl'

Update: Don't put /opt/perl/bin in %PATH