Yeah, I agree with your summary AP, the A220 looks the obvious choice for replacing the B717 & F100 fleets.
The B787-10 range is about 1,000NM shorter than the -9 so it’s still enough to reach all the Asian destinations with a full payload. I’ve heard that Boeing is offering a MBRW for the -10 that is a few tonnes higher which will give it more flexibility.
The possibility of domestic flying for the B787 was one of the reasons why AIPA insisted that MDC be retained despite very strong efforts by QF management to get rid of it.