Option/function for head to fallback to default key

[auwsmit]

This is more of a convenience request than a bug or issue:

I noticed in making hydras recently that I often want the hydra to use some (or many) of the default bindings. I know the pink hydra seems a fit for this, but I still want it to exit in most cases, and I want these bindings to have hints as well.

A good example where this would help is this Ibuffer hydra, which serves as a visual guide rather than providing new bindings. If I were able to simply put hydra-fallback-to-default-key (or something along those lines) in place of all the functions that use default bindings, it would massively simplify the creation of similar hydras in the future.

I suspect there's a work-around way to get this "fallback to default key" function, but I'm just not aware of it or how to do it.