No. Your original post shows that @r is created as a lexical variable within sub interface_control. So, even if you could somehow access @r from outside the sub, you would have to do so either:

• before the sub is called; in which case any changes you made would be overriden within the sub before the print statement is reached; or
• after the sub returns; in which case any changes you made (to a now non-existent variable!) would be too late to affect the printing behaviour.

I’m not familiar with PadWalker, but following Anonymous Monk’s comment above, I had a quick look. As I understand it, PadWalker allows you to access variables in subroutines higher than your current position in the call stack. As you want to access a variable within a subroutine you will be calling, this module won’t help you either. :-(

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