If I wanted to do it quickly because the details didn't matter much, I would just take the non-perl scripts and give them a distinctive name (unlikely to interfere with regular commandline use) and put them in ~/bin

If I wanted a clean solution that was CPAN-looking (even if not going there yet) I would build a module with Dist::Zilla and put the non-perl scripts in ./share and then access them with File::ShareDir.

Any external script that *was* perl, I would refactor into a module and put it in my module path. Well.. unless it was massive and complex and written by someone else, then maybe I would just shell out to it. But I would at least *intend* to refactor it into a module some day.