Yes, these are all solutions, but it takes some getting used to, from an operations and a procedure design.
With RNP, I usually have a transition turn to final. The criteria wants the turn to be at the final segment speed as well, so if you have a 3 nm radius turn, that will be 4nm long, this puts that final CAT C speed of 140kts now back 9nm. We also have to remember this using a 3 degree GPA with idle descent.
If one uses the criteria, at 140 kts, a 2nm turn is possible with the 25 degree bank limit. There are many procedures out there, such as Palm Springs, designed this way. Getting to final config, rolling through a turn like this, was just too tough to accomplish consistently with the 7/8/9 winglet models....and these were very experienced operators.
Hope that clarifies my perspective is on this topic.