I understand that if the whole program was destined to be a 1 million line ERP system, the it would be worth re-organizing and rewriting everything to fit into modules. However I'm aiming at just splitting things into "two" files, and I'm 1 yard from the finish line. So cut/paste into 10 scripts may be the way to go.

No, copy/paste isn't the answer, thats like first week of intro to programming :)

modules are the answer, modules that are accompanied with tests, your code should live in modules :)

Maybe

foo.pl
use BtApp;
BtApp->runFoo;

bar.pl
use BtApp;
BtApp->run( mode => 'Bar', @ARGV );

baz.pl
use BtApp;
BtApp->run( '--mode=Baz' , @ARGV );

btapp.pl
use BtApp; BtApp->cli( @ARGV );

beep.pl
use BtApp; BtApp->cli( beep => @ARGV );

...
BtApp.pm
BtApp/Command/Baz.pm
BtApp/Bar.pm
BtApp/Beep.pm
t/00-load.t
t/command/baz.t
t/bar.t
t/baz.t
t/beep.t
...
[download]

Something like that, draw a few outlines like that on a piece of paper, putting different stuff in different places, see what makes more sense

You can see all kinds of examples on cpan, see App::

https://metacpan.org/release/Module-Starter

tracker/App::TimeTracker

booklist/App::Booklist