Yes, there doesn't seem to be much out there in the way of useful materials for your task. At least, I couldn't find anything decent.

Given your impressive mastery of Python scoping rules you seem well qualified to give this course! You might invent some instructive scoping examples where Perl is simpler and clearer than Python.

In case they are of use, some old Rosetta code nodes:

• Yet Another Rosetta Code Problem (Perl, Ruby, Python, Haskell, ...)
• Rosetta PGA-TRAM
• Rosetta code: Split an array into chunks
• Re^2: Perlplexation - foreach shoulda Known (Rosetta: Perl, Python, Ruby)
• Rosetta Dispatch Table (Interview Question)

Interested to hear feedback on your course and how it went!