This save is immensely helpful, but it does require some manual work.
In order to get the specific difficulty and associated S Rank, you must complete Mission 20 with the character it has already been completed with. This means you must still be good enough at the game to beat the final boss on each respective difficulty.
The same applies for Bloody Palace, you still have to beat the mode with each character/whoever you are missing. I don't think there's any remedying this unless there becomes a way to apply god mode, because I will never be able to clear Bloody Palace with Trish or Lady on my own
Regardless, thank you for sharing. It helped knock off some otherwise very painful trophies.