Did you try either of your proposed solutions?

$ cd /tmp/perlmonks/
$ echo -e '#!/usr/bin/env perl \r\nprint "Foo!\\n";' > foo.pl
$ chmod 0755 foo.pl
$ ./foo.pl
/usr/bin/env: ‘perl \r’: No such file or directory
/usr/bin/env: use -[v]S to pass options in shebang lines
$ echo -e '#!/usr/bin/env perl -w\r\nprint "Foo!\\n";' > foo.pl
$ ./foo.pl 
/usr/bin/env: ‘perl -w\r’: No such file or directory
/usr/bin/env: use -[v]S to pass options in shebang lines
$
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The correct solution is use -S on the env command:

$ echo -e '#!/usr/bin/env -S perl\r\nprint "Foo!\\n";' > foo.pl
$ ./foo.pl 
Foo!
$
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Interesting but doesn't seem to work on my ubuntu:

$ echo -e '#!/usr/bin/env -S perl\r\nprint "Foo!\\n";' > foo.pl
$ chmod 755 foo.pl
$ ./foo.pl
/usr/bin/env: ‘perl\r’: No such file or directory

Which version of env are you running? I have:

env (GNU coreutils) 9.5
Copyright (C) 2024 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <https://gnu.org/licenses/g
+pl.html>.
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.

Written by Richard Mlynarik, David MacKenzie, and Assaf Gordon.
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