So, I might prepend a BEGIN block and push the local path to @INC. I just looked it up, here's what I did in a script some time before: ...

I'd suggest using the lib pragma (which unshifts instead of pushing) in combination with FindBin instead; $0 can in some cases be unreliable, and the code is shorter. So if there are .pm files in the same path as the script: use FindBin; use lib $FindBin::Bin;.

Finally, into some scripts I copied every module needed, also cpan modules, getting a huge single script.

See fatpack and pp, although with some modules they have issues.