Right Way Up,
diving
after the MDA has nothing to do with "diving"
before the MDA.
It must be absolutely clear in every pilot's mind that the MDA can be left only on the PAPI, unless you fly a Piper or an Islander, of course!
Actually, what happens more often, is that with CANPA they end up high and have to dive - yes
dive - to make the landing, while with the other method there's plenty of time to correctly capture the PAPI.
You are right when you say flying level fully configured is bad, but that's not the case: we have repeated various times that you fly level with the approach flaps setting, not the final one.
One last question to those who say a level segment is unacceptable in a large aircraft:
How do you fly a circling approach at the minima?
Oops, sorry, I forgot in your world a good alternate with a good ILS into the wind is always available!