You're correct that the Perl5 parser cannot manage undefined operators. You only get to overload existing operators. Perl6 is supposed to remedy that.

Wasn't there a post recently (on another topic) about creating subroutine names out of any charater string, and not just the standard set? (Maybe it was in obfuscation, but I can't find it.)

Update: Added quote, plus followup:

Here it is: What is this doing, and why is this a good method of doing it?, and where Zaxo describes what it does.