Looks to me like you wrote that code. Which means it doesn't violate the "don't use wizards you didn't write" rule. And yes, I too have written such code. For some of my work code I have a shared framework where I have method manufacturers. But I wrote them, they fit _exactly_ to my needs. I'd never upload them to CPAN because quite simply no other set of applications would ever want to use them.
In other modules I also have method manufacturing code. But again I wrote it. It does exactly what I need, and if I need to I will totally rewrite it for the next release. In my case I also fix one place and it fixes all my code using it, but all the code using it is all the code that will ever use it. And frankly I think that makes a lot more sense than reusing some of the stuff on CPAN. I have full control, understanding and insight of the methods, and they match my requirements and my thinking patterns exactly.
I guess this is like shoes or other custom clothing. Sure you can by mass-produced shoes and like them, but if you go to shoemaker and get a custom pair youll never complain about the fit, and you certainly wont be lending them to anybody else. To me method factories are like shoes. They should always be custom because they fit better that way, and they should never be loaned to somebody else, because they are designed for my feet not theirs.