I don't know what all is currently available for Racket[1], but two
search keywords to slog through are "advice" and "aspect".
Aspects and other framework-y interfaces can be good for extensibility
of a system. (But maybe try to make loosely-coupled reusable modules
that don't need it, as much as practical.) When you don't have an
interface like that, but really-really need it, advice is sometimes a
lifesaver.
Separately, your particular example suggests that Racket's generics
might do what you currently need to do.
[1] It seems a lot of researchy/experimenty independent Racket stuff is
not well-advertised.
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