I'd rather not risk it when the fate of the world is at stake.
Neither of those is an acceptable outcome for us, either.
Way to ignore my main point, Narrator. Again, if Madoka makes her canon wish
without the part that makes her into a concept, her Witch would never come to pass.
As for the whole "neither is an acceptable outcome" bit: that's absurd logic. Is Dedolere an acceptable outcome for us? Because, by your logic, unacceptable outcomes are literally inevitable in that regard. And so is Homura's death or turning into a Witch. And Mami. And Sayaka. See where that logic falls apart?
Like, the fact that Witches are still going to be born no matter what we do is horrible. The fact that Witches already
were born is horrible. All of those grief seeds that the Incubators have are irretrievable, too. And no matter what, Sabrina's reach will never be universal--not without an existing Concept's power to hijack. And Sabrina's power is
nowhere near that of a Concept.
Madoka making her canon wish
excepting the part about her becoming a Concept is precisely the way to ensure that both Homura and Madoka are happy. Madoka eliminates the key problem without sacrificing herself; Homura ensures that Madoka remains happy and alive. Rebellion proves that the Law of Cycles can exist just fine without the Madoka aspect of it. If need be, we can even modify the wish slightly to be absolutely sure that the outcome is the same except for the parts we don't want.
Remember, Wishes can create people out of nothing. Creating a god that isn't her to do all of the things Madokami did in canon is entirely within Madoka's power.
And so what if Madoka becomes a magical girl in the process?
We're around, and if preventing the death of one meguca is beyond us, what the hell are we even attempting to accomplish, here?