Yes, Foo could override the method, then call $self->SUPER::method. (Slight difference, same idea.)

Now, if you're talking about doing some sort of plugin idea ... that's getting really complicated, involving on-the-fly modifications to @ISA, etc. Essentially, what it sounds that you really want to do is create a dispatch table that would have, instead of a coderef, a list of coderefs (or function names) that would be called in that order.

There has to be a better way to do what you want to do.

Period.

Maybe if you started describing what it is you want to design for, we can help.

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Don't go borrowing trouble. For programmers, this means Worry only about what you need to implement.