[galangalalgol]

Matlab has some simple refactoring for names changes. Change a name and press shift+enter to change all other occurrences in the file.

Yes, package creation. The "right way" use create package.jl or whatever feels like a speedbump and requires setup.

When I import the newly created model, I have gotten name collisions with the playground remnants which you can't fully clear without restarting the repl.

That sounds like something I'd use, yeah. If you wanted to be fancy, you could make a function, putting uninitialized values into the argument list.